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Epidemiology:
Original Articles

Confounding and Effect Modification in the Short-Term Effects of Ambient Particles on Total Mortality: Results from 29 European Cities within the APHEA2 Project

Katsouyanni, Klea1; Touloumi, Giota1; Samoli, Evangelia1; Gryparis, Alexandros1; Le Tertre, Alain2; Monopolis, Yannis1; Rossi, Giuseppe3; Zmirou, Denis4; Ballester, Ferran5; Boumghar, Azedine2; Anderson, Hugh Ross6; Wojtyniak, Bogdan7; Paldy, Anna8; Braunstein, Rony9; Pekkanen, Juha10; Schindler, Christian11; Schwartz, Joel12

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From the 1Department of Hygiene and Epidemiology, University of Athens Medical School, Athens, Greece;

2Institut de Veille Sanitaire, Paris, France;

3Fisiologia Clinica CNR, Unit of Epidemiology and Biostatistics, Pisa, Italy;

4Universite Joseph Fourier Public Health Laboratory Medical School Domaine de la Merci, Grenoble, France;

5Epidemiology and Statistics Unit, Escola Valenciana d’Estudis per a la Salut, Conselleria de Sanitat, Generalitat Valenciana, Valencia, Spain;

6Department of Public Health Sciences, St. George’s Hospital Medical School, University of London, United Kingdom;

7National Institute of Hygiene, Department of Medical Statistics, Population Studies Laboratory, Warsaw, Poland;

8J. Fodor National Public Health Centre—National Institute of Environmental Health, Division of Environmental Health Assessment, Budapest, Hungary;

9Department of Epidemiology and Preventive Medicine, Tel Aviv University, Israel;

10National Public Health Institute, Unit of Environmental Epidemiology, Kuopio, Finland;

11Universitat Basel, Institut fur Sozial-und Praventivmedizin, Switzerland;

12Department of Environmental Health, Harvard School of Public Health, Boston, MA.

Address correspondence to: Klea Katsouyanni, Department of Hygiene and Epidemiology, University of Athens Medical School, 75 Mikras Asias Street, 115 27 Athens, Greece.

The Air Pollution and Health: A European Approach (APHEA2) study is supported by the European Commission Environment and Climate 1994–1998 Programme (Contract No. ENV4-CT97–0534). The Swedish and Teplice groups did not receive funding from the European Commission.

Submitted August 14, 2000; final version accepted December 8, 2000.

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Abstract

We present the results of the Air Pollution and Health: A European Approach 2 (APHEA2) project on short-term effects of ambient particles on mortality with emphasis on effect modification. We used daily measurements for particulate matter less than 10 μm in aerodynamic diameter (PM10) and/or black smoke from 29 European cities. We considered confounding from other pollutants as well as meteorologic and chronologic variables. We investigated several variables describing the cities’ pollution, climate, population, and geography as potential effect modifiers. For the individual city analysis, generalized additive models extending Poisson regression, using a smoother to control for seasonal patterns, were applied. To provide quantitative summaries of the results and explain remaining heterogeneity, we applied second-stage regression models. The estimated increase in the daily number of deaths for all ages for a 10 μg/m3 increase in daily PM10 or black smoke concentrations was 0.6% [95% confidence interval (CI) = 0.4–0.8%], whereas for the elderly it was slightly higher. We found important effect modification for several of the variables studied. Thus, in a city with low average NO2, the estimated increase in daily mortality for an increase of 10 μg/m3 in PM10 was 0.19 (95% CI = 0.00–0.41), whereas in a city with high average NO2 it was 0.80% (95% CI = 0.67–0.93%); in a relatively cold climate the corresponding effect was 0.29% (95% CI = 0.16–0.42), whereas in a warm climate it was 0.82% (95% CI = 0.69–0.96); in a city with low standardized mortality rate it was 0.80% (95% CI = 0.65–0.95%), and in one with a high rate it was 0.43% (95% CI = 0.24–0.62). Our results confirm those previously reported on the effects of ambient particles on mortality. Furthermore, they show that the heterogeneity found in the effect parameters among cities reflects real effect modification, which is explained by specific city characteristics.

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During the last decade many epidemiologic studies have found associations between ambient particulate matter (PM) concentrations at below-guideline levels and short-term adverse health effects, including increases in daily mortality. 1–3 The first such studies were regarded with skepticism, 4 but the accumulated evidence was remarkably consistent and robust. 5 An important development in the investigation of the health effects of PM has come from multicenter studies that used a standardized protocol for their data collection and data analysis. Examples of such studies are the Air Pollution and Health: A European Approach (APHEA) project in Europe 6,7 and the Harvard Six Cities project in the United States. 8 Major interest has been focused on potential factors that put people at increased risk of PM-related mortality and on the characteristics and sources of particles that affect their toxicity, as well as on the potential confounding by various other air pollutants. The impact of the above results has been important for the revisions of air-quality standards in the United States and Europe. 9,10

The first multicenter studies were not based on extensive networks and were not able to explore confounding and effect modification satisfactorily. Also, in Europe the APHEA project included limited gravimetric measurement of particles. New multicenter studies include the National Morbidity, Mortality, and Air Pollution Study (NMMAPS) study in the United States 11 and the APHEA2 study in Europe. These studies have tried to assess the consistency of the associations and to address questions of sensitive subpopulations, particle characteristics, and confounding.

We report here the results of the APHEA2 project on short-term effects of ambient particles on all-age and elderly all-cause mortality with emphasis on confounding factors and effect modifiers. In APHEA2 an extended database is used that includes more (29) cities and more extensive exposure data than the older APHEA project. 6 This database allows a more comprehensive and structured approach at the second stage of the analysis, in which we explore the role of effect modifiers in explaining heterogeneity.

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Subjects and Methods

Data
Location, Outcome, and Exposure

Table 1 shows the descriptive data from the 29 cities included in this analysis. The study period was longer than 5 years (1,826 days) for most cities. The total population in all cities was more than 43 million. We excluded 1 of the 30 cities originally providing data (Bucharest, Romania) because of insufficient days of PM concentration data (missing values 37%). The mean daily total number of deaths (excluding deaths from external causes, International Classification of Diseases code ≥800) ranged from 6 to 169 and that for the elderly (>65 years) ranged from 4 to 139. The median levels of black smoke (BS) and PM less than 10 μm in aerodynamic diameter (PM10) concentrations (average of 2 consecutive days) ranged from 9 to 64 and from 14 to 166 μg/m3, respectively. BS levels represent concentrations of black particles with an aerodynamic diameter <4.5 μm. 5 These measurements have a long history in Europe, and although standards for BS have been replaced recently by those for PM10, 12 the results are displayed here both for reasons of continuity and because there is evidence that BS exposure is more relevant to health effects than PM10. 13,14 BS is a better marker of primary combustion products and small particles. 15 Because domestic or industrial burning of coal is minimal in most of the cities studied, BS is more specific for traffic-related particles than PM10 and provides a means of addressing the question of particle composition. Sulfur dioxide (SO2), nitrogen dioxide (NO2), and ozone (O3) concentrations are also shown. Measurements of air pollutants were provided by monitoring networks established in each town. European Union (EU) legislation regulates the methods of air pollutant measurements, 12 and recently most Central-Eastern European countries (which includes all cities in the former Communist countries and which are not EU members) have tried to comply with this regulation. Nevertheless, the recent EU daughter directive for PM10 measurement 12 (replacing the older one for BS) had not been applied during the time periods studied here and, as a result, there is variability in the method of PM10 measurement. We calculated the average daily concentration of each pollutant from as many monitors as possible. We included a monitor in the calculation if certain completeness criteria were fulfilled. 6 Despite the completeness criteria, a few missing values remained and were replaced according to the procedure described below.

Table 1
Table 1
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A missing value on day i of year k from monitor j was replaced by a weighted average of the values of the other monitoring stations as follows:MATH where ¯xi.k is the mean value on day i of year k among all monitors reporting, ¯x.jk is the mean value for monitor j in year k, and ¯x..k is the overall mean level in year k.

Equation U1
Equation U1
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In ten cities (Athens, Basel, Budapest, Cracow, Erfurt, Geneva, Milano, Rome, Torino, and Zurich), PM10 measurements were not available for the whole time period but were estimated using a regression model relating collocated PM10 measurements to the BS (for Athens and Cracow) or total suspended particles measurements (for Budapest and Erfurt) or as a percentage of total suspended particles (based on measurements, for the other cities).

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Confounders

We used the daily average temperature and relative humidity to control for potential confounding effects of meteorologic variables. All available information on influenza epidemics was recorded, and unusual events (for example, heat waves) were also taken into account. We adjusted for day of the week, national and school holidays, seasonality, and long-term trends. The potential confounding effects of the daily levels of other pollutants (Table 1) were investigated, as described below. The correlation coefficients between PM10 and NO2 ranged from 0.12 to 0.75; between PM10 and ozone from −0.38 to +0.38; between PM10 and SO2 from 0.14 to 0.78; and between BS and each of these pollutants from 0.11 to 0.65, −0.55 to −0.04, and 0.41 to 0.77, respectively, in the different cities.

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Potential Effect Modifiers

Substantial heterogeneity in the estimated effect parameters has been observed previously. 7,16–18 It was therefore important to collect information on several variables hypothesized to be potential effect modifiers. These variables are “city characteristics” (that is, one value per city, which characterizes a particular situation, such as its climate or air pollution sources). The potential effect modifiers for which information was recorded are classified into the following four categories.

(1) Air pollution level and mix. This category includes the average levels of PM (PM10 and BS) and that of other pollutants for the whole study period as well as the ratio of PM10 and BS to NO2. The former address the question of whether the effect size depends on the level of exposure per se or on the level of exposure to other pollutants. The ratio of PM to NO2 indicates the extent to which PM comes from traffic, because NO2 is mainly traffic generated. Therefore, a lower PM/NO2 ratio reflects a higher proportion of traffic-generated PM.

(2) Climatic variables. It has often been proposed that the air pollution effects estimated are modified by climate, 19 and this theory is supported by seasonal and geographic differences observed previously. 7,16–18 To characterize a city’s climate, the mean temperature and relative humidity over the whole study period were recorded. The mean annual daily temperature ranged in our cities from 5.9°C (Helsinki) to 17.8°C (Athens) and the mean relative humidity from 48.9% (Marseilles) to 82.3% (Dublin).

(3) Health status of the population. It is also thought that air pollution affects certain subgroups of the population to a greater extent. Older persons and those suffering from chronic cardiorespiratory disease are obvious candidates. As indicators of their size, the age-adjusted mortality and lung cancer mortality rates for each city’s population were used as well as the percentage of persons over 65 years of age and smoking prevalence. The directly standardized annual all-cause mortality rate per 100,000 ranged in our cities from 579 (Lyon) to 1,231 (Lodz). Fifteen cities had values below 800; nine between 800 and 1,000; and five above 1,000. The annual lung cancer mortality rate ranged between 28 and 92 deaths per 100,000 person-years; the proportion of the population >65 years of age between 9% and 21%; and smoking prevalence from 22% to 55%.

(4) Geographic area. It has been observed before 7 (on the basis of fewer cities) that the effect size differed by geographic area. To investigate this further, we classified the cities into three categories: Central-Eastern (which included all cities in the former Communist countries: Budapest, Cracow, Erfurt, Ljubljana, Lodz, Poznan, Prague, Teplice, and Wroclaw), Southern (those with latitude less than 45°: Athens, Barcelona, Bilbao, Madrid, Marseille, Rome, Tel Aviv, and Valencia), and North Western (all other cities). Alternatively we used latitude and longitude.

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Analysis

We used a hierarchic modeling approach. First, we fitted regression models in each city separately to allow specific control for seasonal effects, weather, and other potential confounders. We used the results of the individual city analysis in turn in a second-stage analysis to provide overall estimates and to investigate potential effect modifiers.

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Individual City Data Analysis

We analyzed the data for each city separately according to a predefined standardized methodology, which resulted in a city-specific model. All data were analyzed in one location (Athens) by three statisticians. We applied generalized additive models (GAM) extending Poisson regression to model the nonlinear effects of the covariates, using a local nonparametric loess smoother to control for seasonal patterns and long-term trends, allowing for overdispersion. 20

A broad range of smoothing parameters for time removed the basic seasonality from the data. To choose among these, we used diagnostic tools including partial autocorrelation plots and plots of residuals over time to determine the smoothing parameter (that is, the fraction of the data used for smoothing). We had decided in advance that the smoothing window should not be below 2 months to avoid eliminating short-term patterns actually due to the exposure under study. After seasonal and long-term trends were controlled for, we incorporated meteorologic variables into the model. We investigated smoothed functions of the same day and of lags up to 2 days or averaged over 0 to 2 days of daily mean temperature and relative humidity. Same-day values were always included. The inclusion of lagged weather variables and the choice of smoothing parameters for all of the weather variables were done by minimizing Akaike’s information criterion. 20 Finally, we added dummy variables to the model to control for day of the week, holidays, or unusual events if necessary.

Information on daily influenza counts was not available for all cities. On the basis of results from a sensitivity analysis (manuscript in preparation), we decided to control for influenza using a dummy variable taking the value 1 for days when the 7-day moving average of the daily respiratory number of deaths was greater than the 90th percentile of its distribution and 0 otherwise. Thus, influenza control was uniform for all cities.

The air pollution variables were put into the model last. Previous results have indicated that in areas with high particle concentrations, log-transformed measurements of particles best represented the mortality-particle relation. 21 To facilitate the second-stage analysis, we decided to use only linear terms, and thus the analysis was restricted to days with BS or PM10 concentrations below 150 μg/m3. We decided a priori to use the average of lags 0 and 1 for BS and PM10 measurements. This decision was based on previous studies having shown those lags to be the most relevant. 22 It also avoids potential bias, which could result from selectively reporting those lags associated with the largest effect estimates. We also fitted two-pollutant models to adjust for the confounding effects of SO2, O3, and NO2. Carbon monoxide measurements were not used, because there were many cities with incomplete measurements or without carbon monoxide measurements. If serial correlation remained in the residuals of the final models, autoregressive terms were added. All analyses were done using S-Plus. 23

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Second-Stage Analysis

We applied a second-stage analysis to provide a quantitative summary of all individual city results and to explain heterogeneity, if present. We assumed that the city-specific estimates bi were normally distributed around an overall estimate, assuming heterogeneity. To examine this heterogeneity we assumed biN0 + γzi, Ω) where β0 is the mean of the bi values, zi is a vector of effect modifiers in city i, γ is the vector of regression coefficients for the effect modifiers, and Ω is the covariance. Such hierarchic models are becoming more common in epidemiology. 24

To investigate the role of potential effect modifiers, we applied univariate (for one-pollutant models) or multivariate (for two-pollutant models) regression models. We estimated fixed-effects pooled regression coefficients by weighted ecologic regression of city-specific estimates on potential effect modifiers (at city level) with weights inversely proportional to their city-specific variances. If substantial heterogeneity among city results (beyond the variation associated with the effect modifiers) remained, random-effects regression models were applied. In these latter models, it was assumed that the individual coefficients are a sample of independent observations from the normal distribution with mean equal to the random-effects pooled estimate and variance equal to the between-cities variance. We estimated the between-cities variance from the data, using the maximum likelihood method described by Berkey et al, 25 and this variance was added to the city-specific variances.

For multivariate second-stage regression models, we applied the method described by Berkey et al. 26 In contrast to the usual univariate second-stage regression, in which results from each pollutant are analyzed separately, the multivariate model provides more accurate estimates by incorporating the correlation among pollutants within each city. Specific S-Plus functions (available on request) were written to fit the univariate and multivariate second-stage regression models.

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Results

Figure 1 shows the percentage increase in the daily number of deaths associated with 10 μg/m3 increase in PM10 measurements for each city as well as the pooled estimates. Because there was substantial heterogeneity in the single-city results, pooled estimates using random-effects models are also shown. The estimated increases (per 10 μg/m3 increase in PM10) for single cities ranged from −0.6% to 1.5%. The combined increase in the total number of deaths associated with 10 μg/m3 increase in the daily PM10 concentrations was 0.7% [95% confidence interval (CI) = 0.6–0.8%] under the fixed-effects model and 0.6% (95% CI = 0.4–0.8%) under the random-effects model. Figure 2 shows the corresponding individual city and pooled increase in daily deaths associated with a 10 μg/m3 increase in BS. The figures for each city ranged from −0.2% to 1.6% (χ2 for heterogeneity = 46.9, degrees of freedom = 13), and the combined estimate for the same increase under the fixed-effects model was 0.5% (95% CI = 0.4–0.6%) and under the random-effects model 0.6% (95% CI = 0.3–0.8%). When we considered only deaths among the elderly (>65 years of age), the corresponding percentage increase for PM10 was 0.8% (95% CI = 0.7–0.9%) under the fixed-effects model and 0.7% (95% CI = 0.5–1.0%) under the random-effects model, whereas for BS it was 0.6% (95% CI = 0.5–0.8%) and 0.7% (95% CI = 0.4–0.9), respectively.

Figure 1
Figure 1
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Figure 2
Figure 2
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To test the sensitivity of the above results for estimated PM10 series, we excluded the ten cities for which the PM10 series were not originally complete. The combined estimated increase remained similar; that is, a 0.7% increase in deaths was associated with a 10 μg/m3 increase in PM10, both under the fixed-effects and the random-effects models (corresponding 95% CI = 0.6–0.9% and 0.5–0.9%, respectively).

Table 2 shows results from two-pollutant models combined using multivariate second-stage regression, adjusting in turn for the confounding effects of SO2, O3, and NO2. PM10 associations with total mortality were not substantially confounded by O3 or SO2 concentrations. In contrast, the estimated combined increase in mortality for 10 μg/m3 increase in PM10 was reduced by 48% when adjusting for NO2. BS associations with total mortality were slightly confounded by SO2 levels and substantially confounded by the levels of NO2 and O3. When adjusting for NO2, the estimated increase in total mortality associated with 10 μg/m3 increase in BS concentrations was reduced by 55%, whereas, when adjusting for O3, it became larger by 52%. In all of the multivariate second-stage models results, there remained substantial heterogeneity in the other pollutant-adjusted coefficients for PM10 and BS.

Table 2
Table 2
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We investigated the observed heterogeneity in the effect estimates of both PM10 and BS, taking into account the potential effect modifiers through second-stage regression models. Table 3 shows the change in the PM10 regression coefficient and its 95% CI when an effect modifier was included in the second-stage regression model. It also shows the resulting estimated PM10 effect (that is, the increase in the total daily number of deaths, per 10 μg/m3 increase in daily PM10 concentrations) for a city characterized by a value in the effect modifier equal to the 25th (low) and 75th (high) percentile of the distribution of this particular effect modifier. Among the potential effect modifiers, only those explaining more than 10% of the heterogeneity are presented. Several variables appeared to be effect modifiers.

Table 3
Table 3
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Of the pollutants considered, NO2 was the most important effect modifier; in a city with low long-term average NO2 concentration, the estimated increase in daily mortality, associated with an increase of 10 μg/m3 in PM10, was 0.19%, whereas in a city with high NO2 it was 0.80%. The other pollutants considered were not important. The ratio of PM10 to NO2 was also important, with a lower ratio associated with a larger PM10 effect. These were followed by temperature, humidity, age-standardized mortality, the proportion of the elderly, and geographic area. In contrast, lung cancer mortality and smoking prevalence were not important. When the best effect modifier from each category (that is, NO2 levels, temperature, and standardized mortality) was included with the others in a second-stage model with three effect modifiers, most of the heterogeneity was explained and the remaining heterogeneity was substantially reduced. Figure 3 shows the scatter plots of the individual city effect parameters for PM10 by the levels of the most important effect modifiers.

Figure 3
Figure 3
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In Table 4, the second-stage regression results for BS effect estimates are shown. Geographic area, NO2 concentrations, and temperature were the most important effect modifiers. In a second-stage regression model with four effect modifiers (as described above for PM10, plus geographic area), most of the heterogeneity was explained. Figure 4 shows the scatter plots of the effect parameters for BS by the levels of the most important effect modifiers.

Table 4
Table 4
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Figure 4
Figure 4
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The results of second-stage regression models for the effect parameters among deaths in the elderly showed a practically identical pattern, both for BS and PM10 effects, with the coefficients changing at the second or third significant digit.

Because NO2 was a confounder in the PM-mortality association, we also tried multivariate second-stage regression models with the estimated effect parameters of PM and NO2 for each city as dependent variables and average long-term NO2 concentrations as a potential effect modifier. This approach gave results on modification of the effect parameters of the PM exposure indicators (PM10 and BS) by NO2 after adjusting for the confounding effects of NO2. NO2 level continued to act as an effect modifier after we adjusted for confounding of its daily fluctuations on the PM effect parameters in each city. Thus, in a city with low NO2 concentration, the adjusted estimated increase in mortality associated with a 10 μg/m3 increase in PM10 was 0.11% and in a city with high NO2 it was 0.51%, with the corresponding figures for BS being 0.11% and 0.38%.

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Discussion

This study, based on the most extensive database available in Europe until today, confirmed the short-term effects of ambient particle concentrations on the daily number of deaths found in previous studies 7,11,16–18,27–31 and provided new results on confounding and effect modification by a number of variables. We emphasize that even though other pollutants are potential confounders and effect modifiers of the PM10-mortality association, they are also, largely, indices of a complex process shaped by emissions, secondary reactions, the location of fixed-site monitors, and measurement error related to their representativeness of the average population exposure.

We found that both PM10 and BS were predictors of daily deaths across Europe, with similar size of the effect estimates. The analyses were restricted to days with concentrations below 150 μg/m3 and hence cannot be interpreted as reflecting the effects of a few high days. This study was based on a much larger database compared with a related previous project (APHEA1) that used data from 12 cities 7 and included mostly BS measurement of particles with very limited gravimetric data. The statistical methods applied here differ from those used before, and a sensitivity analysis comparing methods has been reported. 32 The results found here for BS effects are consistent with those reported from the previous project 32 in which the overall estimated increase per 10 μg/m3 increase in 1-day BS level was 0.6% (95% CI = 0.5–0.7%), when analysis was restricted to days with BS concentrations <150 μg/m3.

Within the U.S. NMMAPS project, 11,31 which has just been concluded, the analysis of data from the 90 largest U.S. cities found that PM10 levels were associated with a 0.5% increase in the total daily number of deaths per 10 μg/m3. The effect reported from NMMAPS is slightly smaller than the one found in APHEA2. The APHEA2 estimate is based on a 2-day average PM10 concentration (average of lags 0 and 1), whereas the NMMAPS is based on a 1-day level, and it has consistently been found that exposures based on more than 1-day averages are associated with larger effect estimates. 16–18,22,33

Since the early reports of associations between ambient particles and daily deaths, questions have arisen about the potential for those effects to be confounded by other air pollutants. We have addressed that issue in our analyses using two-pollutant models. We found no evidence for the effects of PM10 to be confounded by SO2 or ozone. BS effects were not confounded by SO2 either but were higher with simultaneous control for ozone. These results are supported by the similar findings of Schwartz, 34 who has recently reported on a multicity analysis of ten U.S. locations, and Samet et al11 and Schwartz et al, 20 who examined two- and three-pollutant models in the 20 largest U.S. cities. On the basis of these large studies, we believe that confounding by SO2 or ozone can be dismissed as an explanatory factor for observed associations with particles. In contrast, we did find evidence that both the PM10 and BS associations were moderately confounded by NO2. These results are different from those reported in the United States, where Samet et al11,31 find no evidence of confounding by NO2. The most obvious explanation for this finding lies in the difference in relative source contribution between European and U.S. cities. In the United States, there are few diesel cars. In contrast, in many European cities, diesel cars approach 50% of all cars. Therefore, motor vehicles are a larger source of urban particles in Europe than in the United States, where they are the predominant source of urban NO2. Hence, it may be more difficult to distinguish between NO2 and particles in Europe than in the United States. If particle measures were only standing for NO2, however, then the results of Samet et al11,31 would be unexpected. Hence, it would be unwise to interpret these results as indicating that half of the particle effects are really the result of NO2. If we consider NO2 to be correlated better with traffic-generated particles (as opposed to particles from other sources), then the NO2-adjusted effect estimates may reflect, to a larger extent, the effects of particles from sources other than traffic. This issue is discussed further below.

Ambient particles are a mixture with different physical and chemical characteristics of which the particular health effects are not fully understood. There is growing evidence that particles with a smaller aerodynamic diameter (that is, 10 or even 2.5 μm 35 or perhaps smaller 36) are more relevant for human health. In Europe, BS, a measure of black particles with aerodynamic diameter <4.5 μm has, historically, been the routine indicator of particles. BS, a photometric measure, is converted to mass using the same outdated calibration curve for all locations. As a result, the mass quantities calculated are unlikely to be accurate. PM10 measurements (used to set the PM standard since about 20 years ago in the United States but only recently in Europe) represent all particles with an aerodynamic diameter less than 10 μm, a mixture of primary and secondary particles from different sources with varying characteristics and levels of toxicity. In the European PEACE project, in which both BS and PM10 were measured in 28 European areas, the PM10/BS ratios ranged from 0.67 to 3.67. 37 PM2.5 has not been routinely measured to any extent so far. Although it is generally accepted that ambient particles have important health effects, it is also recognized that there remain uncertainties concerning the nature of the exposure and the mechanisms of effect. The heterogeneity of single-city effect estimates supports the hypothesis that the composition of particles differs among locations in a way relevant to their health effects. An indirect way (given that, in this situation, it is very difficult to implement experimental designs) to investigate the toxicity of particles according to specific aspects of their particular characteristics is to evaluate the potential effect modification of factors influencing their composition across a number of environments. The extended database available to this study allowed us this possibility.

Among the potential effect modifiers identified, an important one is NO2 concentration, an indicator of pollution originating from traffic. The higher the NO2 concentrations (in absolute terms or relative to PM10) the larger the effect observed on mortality. This relation suggests that particles originating from vehicle exhausts are more toxic than those from other sources. Unfortunately, it was not possible to investigate the BS-to-PM10 ratio as an effect modifier in our study, because only four cities provided complete and independent concurrent BS and PM10 measurements. Our conclusion is supported by other work. For example, Laden et al38 have examined the elemental composition of all of the PM2.5 filters from the Harvard Six Cities Study. Using estimates of the daily mass concentration of traffic particles, long-range traffic particles, crustal particles, and particles from local sources in each city simultaneously in a regression for daily mortality, they found associations with particle mass from traffic and from long-range transport. The slope (per μg/m3) of the effect for the traffic particles was twice as great as that for the long-range transport particles.

We have also found important effect modification by other variables. The effect parameters estimated are larger in warmer and drier countries. Temperature is a much more important effect modifier than humidity. The results remain the same if latitude is used instead of temperature. A possible explanation for this finding may be that in warmer countries, outdoor fixed-site air pollution measurements may represent the average population exposure better than the measurements in colder climates, as people tend to keep their windows open and spend more time outdoors. This finding is consistent with the larger effect estimates found during the warm season in previous studies. 7,28,29 Other studies, however, have found little difference in effect size estimates by season. 34

In previous reports, 7 we have hypothesized that the health status of a population may be an effect modifier in the PM-mortality association. This hypothesis was confirmed by our finding that the larger the age-standardized mortality rate is (that is, the shorter the life expectancy), the smaller are the estimated PM10 effects. A large age-standardized mortality rate was related to a smaller proportion of elderly persons (Spearman r = −0.33) in this study and, probably, to the presence of competing risks for the same disease entities. It was therefore related to a smaller proportion of individuals belonging to vulnerable groups (for example, those with chronic respiratory diseases) who are more susceptible to PM effects.

The only clear effect modifier identified in the previous APHEA project 7 was a geographic separation between Central-Eastern and Western European countries, and the estimates for BS effects found here for these regions are close to the ones reported before.

Differences in the levels of the identified effect modifiers may explain the small difference found in the estimated effects between the APHEA2 and NMMAPS projects. In the NMMAPS project, regional differences were found in the effect estimates that were larger in the Northeast of the United States and smaller in the Southeast. The continuing pattern of regional differences in both studies suggests that further work on particle composition as an explanatory factor is warranted.

In the analysis by Levy et al, 33 effect modification has also been investigated. Larger increases in mortality were found in populations with a proportion of persons over 65 years of age greater than 13% (0.77%) than in those with a smaller proportion of elderly (0.64%). The most important positive predictor of the effect size was the ratio PM2.5/PM10. In univariate analysis, there was some effect modification by NO2, but in a multivariate model, including ten effect modifiers among which was the ratio PM2.5/PM10, little effect modification by NO2 was observed.

Comparing the results for BS and PM10, we find the same effect sizes and modification patterns. The estimates for BS are more heterogeneous and greatly influenced by the effect parameters found in the four Polish cities where BS represents industrial and heating coal combustion as well as traffic. Previous studies have reported larger BS effects. 13,14 These results together with the indications that traffic particles are more toxic, noted above, suggest that continued monitoring of BS, or ethelometric monitoring of carbon, would be of considerable interest and importance for both future studies and assessment of potential health risks, and question the wisdom of abandoning the measure.

In conclusion, our results confirm those previously reported in Europe and the United States about the magnitude of the effects of ambient particles on the total daily number of deaths. They also indicate that the heterogeneity found in the PM effect parameters from different cities reflects real effect modification, which may be explained by factors characterizing the air pollution mix, climate, and the health of the population. This finding has important consequences for estimating the air pollution health effects in a specific population and can influence policy and decisions for environmental management.

The Air Pollution and Health: A European Approach (APHEA2) collaborative group consists of: K. Katsouyanni, G. Touloumi, E. Samoli, A. Gryparis, Y. Monopolis, E. Aga, and D. Panagiotakos (Greece; coordinating center); C. Spix, A. Zanobetti, and H. E. Wichmann (Germany); H. R. Anderson, R. Atkinson, and J. Ayres (United Kingdom); S. Medina, A. Le Tertre, P. Quenel, L. Pascale, and A. Boumghar (Paris, France); J. Sunyer, M. Saez, F. Ballester, S. Perez-Hoyos, J. M. Tenias, E. Alonso, K. Kambra, E. Aranguez, A. Gandarillas, I Galan, and J. M. Ordonez (Spain); M. A. Vigotti, G. Rossi, E. Cadum, G. Costa, L. Albano, D. Mirabelli, P. Natale, L. Bisanti, A. Bellini, M. Baccini, A. Biggeri, P. Michelozzi, V. Fano, A. Barca, and F. Forastiere (Italy); D. Zmirou and F. Balducci (Grenoble, France); J. Schouten and J. Vonk (The Netherlands); J. Pekkanen and P. Tittanen (Finland); L. Clancy and P. Goodman (Ireland); A. Goren and R. Braunstein (Israel); C. Schindler (Switzerland); B. Wojtyniak, D. Rabczenko, and K. Szafraniek (Poland); B. Kriz, A. M. Celko, and J. Danova (Prague, Czech Republic); A. Paldy, J. Bobvos, A. Vamos, G. Nador, I. Vincze, P. Rudnai, and A. Pinter (Hungary); E. Niciu, V. Frunza, and V. Bunda, (Romania); M. Macarol-Hitti and P. Otorepec (Slovenia); Z. Dörtbudak and F. Erkan (Turkey); B. Forsberg and B. Segerstedt, (Sweden); F. Kotesovec and J. Skorkovski (Teplice, Czech Republic); and M. Pavlovic and D. Simic (Croatia).

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Occupational and Environmental Medicine
Particulate matter and out-of-hospital coronary deaths in eight Italian cities
Serinelli, M; Vigotti, MA; Stafoggia, M; Berti, G; Bisanti, L; Mallone, S; Pacelli, B; Tessari, R; Forastiere, F
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American Journal of Epidemiology
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British Medical Journal
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Journal of Exposure Science and Environmental Epidemiology
Daily mortality and particulate matter in different size classes in Erfurt, Germany
Stoelzel, M; Breitner, S; Cyrys, J; Pitz, M; Woelke, G; Kreyling, W; Heinrich, J; Wichmann, HE; Peters, A
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Basic Research in Cardiology
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Simkhovich, BZ; Marjoram, P; Kleinman, MT; Kloner, RA
Basic Research in Cardiology, 102(6): 467-475.
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European Heart Journal
Rapid effects of air pollution on ventricular arrhythmias
Ljungman, PLS; Berglind, N; Holmgren, C; Gadler, F; Edvardsson, N; Pershagen, G; Rosenqvist, M; Sjogen, B; Bellander, T
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Communications in Statistics-Simulation and Computation
Accounting for Data-Dependent Degrees of Freedom Selection When Testing the Effect of a Continuous Covariate in Generalized Additive Models
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Science of the Total Environment
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Asmi, E; Antola, M; Yli-Tuomi, T; Jantunen, M; Aarnio, P; Makela, T; Hillamo, R; Hameri, K
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Journal of Epidemiology and Community Health
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Journal of Epidemiology and Community Health
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Ballester, F; Rodriguez, P; Iniguez, C; Saez, M; Daponte, A; Galan, I; Taracido, M; Arribas, F; Bellido, J; Cirarda, FB; Canada, A; Guillen, JJ; Guillen-Grima, F; Lopez, E; Perez-Hoyos, S; Lertxundi, A; Toro, S
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Atmospheric Environment
Determinants of indoor air concentrations of PM2.5, black smoke and NO2 in six European cities (EXPOLIS study)
Lai, HK; Bayer-Oglesby, L; Colvile, R; Gotschi, T; Jantunen, MJ; Kunzli, N; Kulinskaya, E; Schweizer, C; Nieuwenhuijsen, MJ
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Environmental Health Perspectives
GIS approaches for the estimation of residential-level ambient PM concentrations
Liao, DP; Peuquet, DJ; Duan, YK; Whitsel, EA; Dou, JW; Smith, RL; Lin, HM; Chen, JC; Heiss, G
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Journal of Thrombosis and Haemostasis
Effects of exposure to air pollution on blood coagulation
Baccarelli, A; Zanobetti, A; Martinelli, I; Grillo, P; Hou, L; Giacomini, S; Bonzini, M; Lanzani, G; Mannucci, PM; Bertazzi, PA; Schwartz, J
Journal of Thrombosis and Haemostasis, 5(2): 252-260.

Pharmacology & Therapeutics
The pharmacology of particulate matter air pollution-induced cardiovascular dysfunction
Bai, N; Khazaei, M; van Eeden, SF; Laher, I
Pharmacology & Therapeutics, 113(1): 16-29.
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Environment International
Differentiating the effects of fine and coarse particles on daily mortality in Shanghai, China
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Journal of Epidemiology
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Atmospheric Environment
Modal structure and spatial-temporal variations of urban and suburban aerosols in Helsinki - Finland
Hussein, T; Hameri, KA; Aalto, PP; Paatero, P; Kulmala, M
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Journal of Toxicology and Environmental Health-Part A-Current Issues
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Journal of Epidemiology and Community Health
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American Journal of Respiratory and Critical Care Medicine
A case-crossover analysis of out-of-hospital coronary deaths and air pollution in Rome, Italy
Forastiere, F; Stafoggia, M; Picciotto, S; Bellander, T; D'Ippoliti, D; Lanki, T; von Klot, S; Nyberg, F; Paatero, P; Peters, A; Pekkanen, J; Sunyer, J; Perucci, CA
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International Archives of Occupational and Environmental Health
Impact of urban air pollutants and noise levels over daily hospital admissions in children in Madrid: a time series analysis
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American Journal of Epidemiology
On the use of generalized additive models in time-series studies of air pollution and health
Dominici, F; McDermott, A; Zeger, SL; Samet, JM
American Journal of Epidemiology, 156(3): 193-203.

European Heart Journal
The association of daily sulfur dioxide air pollution levels with hospital admissions for cardiovascular diseases in Europe (The Aphea-II study)
Sunyer, J; Ballester, F; Le Tertre, A; Atkinson, R; Ayres, JG; Forastiere, F; Forsberg, B; Vonk, JM; Bisanti, L; Tenias, JM; Medina, S; Schwartz, J; Katsouyvanni, K
European Heart Journal, 24(8): 752-760.
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Lubrication Science
A disc brake test stand for measurement of airborne wear particles
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Environmetrics
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Muggeo, VMR
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Occupational and Environmental Medicine
Air pollution and doctors' house calls for respiratory diseases in the Greater Paris area (2000-3)
Chardon, B; Lefranc, A; Granados, D; Gremy, I
Occupational and Environmental Medicine, 64(5): 320-324.
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Environmental Health Perspectives
Short-term effects of carbon monoxide on mortality: An analysis within the APHEA project
Samoli, E; Touloumi, G; Schwartz, J; Anderson, HR; Schindler, C; Forsberg, B; Vigotti, MA; Vonk, J; Kosnik, M; Skorkovsky, J; Katsouyanni, K
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Environmental Health Perspectives
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Environmental Health Perspectives, 116(1): 64-69.
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International Journal of Climatology
The effects of weather and air pollution on cardiovascular and respiratory mortality in Santiago, Chile, during the winters of 1988-1996
Grass, D; Cane, M
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Circulation
Particulate air pollution as a risk factor for ST-segment depression in patients with coronary artery disease
Chuang, KJ; Coull, BA; Zanobetti, A; Suh, H; Schwartz, J; Stone, PH; Litonjua, A; Speizer, FE; Gold, DR
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Occupational Medicine-Oxford
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Atmospheric Environment
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American Journal of Epidemiology
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Environmental Health Perspectives
Comparison of oxidative properties, light absorbance, and total and elemental mass concentration of ambient PM2.5 collected at 20 European sites
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Archives of Environmental & Occupational Health
Health impact assessment of particulate matter in Tokyo, Japan
Yorifuji, T; Yamamoto, E; Tsuda, T; Kawakami, N
Archives of Environmental & Occupational Health, 60(4): 179-185.

Indoor Air
Lung deposition of fine and ultrafine particles outdoors and indoors during a cooking event and a no activity period
Mitsakou, C; Housiadas, C; Eleftheriadis, K; Vratolis, S; Helmis, C; Asimakopoulos, D
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Heart
Why cardiologists should be interested in air pollution
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Revue D Epidemiologie Et De Sante Publique
Urban particulate air pollution: from epidemiology to health impact in public health
Filleul, L; Medina, S; Cassadou, S
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British Medical Bulletin
Ambient air pollution and health
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Annual Review of Public Health
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Environmental Health Perspectives
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Journal of Toxicology and Environmental Health-Part A-Current Issues
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Atmospheric Environment
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Revue Francaise D Allergologie
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Archives of Environmental & Occupational Health
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Tam, WWS; Wong, TW; Chair, SY; Wong, AHS
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Occupational and Environmental Medicine
Respiratory effects of sulphur dioxide: a hierarchical multicity analysis in the APHEA 2 study
Sunyer, J; Atkinson, R; Ballester, F; Le Tertre, A; Ayres, JG; Forastiere, F; Forsberg, B; Vonk, JM; Bisanti, L; Anderson, RH; Schwartz, J; Katsouyanni, K
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Environmental Health Perspectives
The temporal pattern of respiratory and heart disease mortality in response to air pollution
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Inhalation Toxicology
Association between ozone and respiratory admissions among children and the elderly in Vancouver, Canada
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Environmental Health Perspectives
A Bayesian hierarchical approach for relating PM2.5 exposure to cardiovascular mortality in North Carolina
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Environmental Health Perspectives, 112(): 1282-1288.

American Journal of Respiratory and Critical Care Medicine
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Canadian Journal of Public Health-Revue Canadienne De Sante Publique
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Canadian Journal of Public Health-Revue Canadienne De Sante Publique, 97(2): 105-108.

Critical Reviews in Toxicology
Short-term effects of particulate matter: An inflammatory mechanism?
Scapellato, ML; Lotti, M
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Sang Thrombose Vaisseaux
Atmospheric pollution: a cardiovascular risk factor
Ruidavets, JB; Ferrieres, J
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Journal of Toxicology and Environmental Health-Part A-Current Issues
Outdoor and indoor respirable air particulate concentrations in differing urban traffic microenvironments
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2009 International Conference on Space Science and Communication
Elemental Characterization of PM10 in UKM Campus
Kadhum, AAH; Batiha, MA; Musa, AY; Mohamd, AB
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Lancet
Air pollution and health
Brunekreef, B; Holgate, ST
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Human and Ecological Risk Assessment
Which effect measure should be used for impact assessment in a new population context?
Roosli, M; Kunzli, N; Schindler, C; Braun-Fahrlander, C
Human and Ecological Risk Assessment, 9(3): 709-719.

Croatian Medical Journal
Eighty years of the Slovenian institute of public health: Challenges for the future
Klavs, I; Albreht, T; Berger, T; Drev, A; Kraigher, A; Berger, DM; Otorepec, P; Rogac, M; Seljak, M; Stergar, E; Svab, I; Marusic, A
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Journal of Epidemiology and Community Health
Predicted health impacts of urban air quality management
Mindell, J; Joffe, M
Journal of Epidemiology and Community Health, 58(2): 103-113.

Scandinavian Journal of Work Environment & Health
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Penttinen, P; Tittanen, P; Pekkanen, J
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Environmental Health
An ecological time-series study of heat-related mortality in three European cities
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Polish Journal of Environmental Studies
Influence of vehicular traffic on concentration and particle surface composition of PM10 and PM2.5 in Zabrze, Poland
Rogula-Kozlowska, W; Pastuszka, JS; Talik, E
Polish Journal of Environmental Studies, 17(4): 539-548.

Polish Journal of Environmental Studies
Environmental Impacts of Long-Term Air Pollution Changes in Krakow, Poland
Bokwa, A
Polish Journal of Environmental Studies, 17(5): 673-686.

American Journal of Epidemiology
Effects of Cold Weather on Mortality: Results From 15 European Cities Within the PHEWE Project
Analitis, A; Katsouyanni, K; Biggeri, A; Baccini, M; Forsberg, B; Bisanti, L; Kirchmayer, U; Ballester, F; Cadum, E; Goodman, PG; Hojs, A; Sunyer, J; Tiittanen, P; Michelozzi, P
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Bmc Infectious Diseases
Evaluation of alternative respiratory syndromes for specific syndromic surveillance of influenza and respiratory syncytial virus: a time series analysis
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Epidemiologia & Prevenzione
Air pollution and mortality in ten Italian cities. Results of the EpiAir Project
Stafoggia, M; Faustini, A; Rognoni, M; Tessari, R; Cadum, E; Pacelli, B; Pandolfi, P; Miglio, R; Mallone, S; Vigotti, MA; Serinelli, M; Accetta, G; Dessi, MP; Cernigliaro, A; Galassi, C; Berti, G; Forastiere, F
Epidemiologia & Prevenzione, 33(6): 65-76.

Archives of Environmental Protection
Polycyclic Aromatic Hydrocarbons in Pm1, Pm2.5, Pm10 and Tsp in the Upper Silesian Agglomeration, Poland
Klejnowski, K; Kozielska, B; Krasa, A; Rogula-Kozlowska, W
Archives of Environmental Protection, 36(2): 65-72.

British Journal of Ophthalmology
Effects of air pollution and climatic conditions on the frequency of ophthalmological emergency examinations
Bourcier, T; Viboud, C; Cohen, JC; Thomas, F; Bury, T; Cadiot, L; Mestre, O; Flahault, A; Borderie, V; Laroche, L
British Journal of Ophthalmology, 87(7): 809-811.

Aerosol Science and Technology
PM1.0 and PM2.5 characteristics in the roadside environment of Hong Kong
Lee, SC; Cheng, Y; Ho, KF; Cao, JJ; Louie, PKK; Chow, JC; Watson, JG
Aerosol Science and Technology, 40(3): 157-165.
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Social Science & Medicine
Spatial implications of covariate adjustment on patterns of risk: Respiratory hospital admissions in Christchurch, New Zealand
Sabel, CE; Wilson, JG; Kingham, S; Tisch, C; Epton, M
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Environmental Modeling & Assessment
Time series modelling of respiratory hospital admissions and geometrically weighted distributed lag effects from ambient particulate air pollution within Kathmandu Valley, Nepal
Shrestha, SL
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Medizinische Klinik
Particulate matter and cardiovascular health in the European union: Time for prevention?
Meyer, C; Schueller, PO; Hennersdorf, M; Kraus, T; Goepel, E; Schauerte, P; Rassaf, T; Kelm, M
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International Journal of Environmental Science and Technology
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Nkwocha, EE; Egejuru, RO
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American Journal of Respiratory and Critical Care Medicine
Fibrinogen Genes Modify the Fibrinogen Response to Ambient Particulate Matter
Peters, A; Greven, S; Heid, IM; Baldari, F; Breitner, S; Bellander, T; Chrysohoou, C; Illig, T; Jacquemin, B; Koenig, W; Lanki, T; Nyberg, F; Pekkanen, J; Pistelli, R; Ruckerl, R; Stefanadis, C; Schneider, A; Sunyer, J; Wichmann, HE
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Environmental Health Perspectives
Autonomic Effects of Controlled Fine Particulate Exposure in Young Healthy Adults: Effect Modification by Ozone
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Journal of Epidemiology and Community Health
Exposure to fine particulate matter and acute effects on blood pressure: effect modification by measures of obesity and location
Kannan, S; Dvonch, JT; Schulz, AJ; Israel, BA; Mentz, G; House, J; Max, P; Reyes, AG
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European Respiratory Journal
Carbon monoxide pollution is associated with decreased lung function in asthmatic adults
Canova, C; Torresan, S; Simonato, L; Scapellato, ML; Tessari, R; Visentin, A; Lotti, M; Maestrelli, P
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Environmental Research
Ambient air pollution and respiratory health effects in mail carriers
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Fresenius Environmental Bulletin
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Thorax
Temporal relationship between air pollutants and hospital admissions for chronic obstructive pulmonary disease in Hong Kong
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Inhalation Toxicology
Cardiovascular disease and air pollutants: Evaluating and improving epidemiological data implicating traffic exposure
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Journal of Exposure Science and Environmental Epidemiology
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Andersen, ZJ; Wahlin, P; Raaschou-Nielsen, O; Scheike, T; Loft, S
Journal of Exposure Science and Environmental Epidemiology, 17(7): 625-636.
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Inhalation Toxicology
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Afinidad
Particulate matter levels in Telde (Gran Canaria Island)
Cancio, JAL; Castellano, AV; Martin, SS; Bethencourt, RG
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International Journal of Environment and Pollution
Effects of air pollution and meteorological parameters on human health in the city of Athens, Greece
Mentzakis, E; Delfino, D
International Journal of Environment and Pollution, 40(): 210-225.

Environmental Health
Air pollution and mortality in the Canary Islands: a time-series analysis
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Australian and New Zealand Journal of Public Health
The short-term effects of air pollution on daily mortality in four Australian cities
Simpson, R; Williams, G; Petroeschevsky, A; Best, T; Morgan, G; Denison, L; Hinwood, A; Neville, G; Neller, A
Australian and New Zealand Journal of Public Health, 29(3): 205-212.

Statistical Modelling
Mining epidemiological time series: an approach based on dynamic regression
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Environmental Research
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Plos One
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European Respiratory Journal
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Science of the Total Environment
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Circulation Research
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Atmospheric Environment
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Spectrochimica Acta Part B-Atomic Spectroscopy
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Atmospheric Environment
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International Journal of Occupational and Environmental Health
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Climate Research
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Occupational and Environmental Medicine
The EMECAM project: a multicentre study on air pollution and mortality in Spain: combined results for particulates and for sulfur dioxide
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Nanosafe 2012: International Conferences on Safe Production and Use of Nanomaterials
Immunological Assays as an Opportunity of Assessment of Health Risks of Airborne Particle Mixture Including Nanoparticles
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Environmental Health
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Impact of Air Pollution on Cystic Fibrosis Pulmonary Exacerbations A Case-Crossover Analysis
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Zhurnal Nevrologii I Psikhiatrii Imeni S S Korsakova
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Salud Publica De Mexico
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European Respiratory Journal
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Polish Journal of Environmental Studies
Relative Risk of Total and Cardiovascular Mortality in the Eldery as Related to Short-Term Increases of PM2.5 Concentrations in Ambient Air
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Environmental Health
Long-term air pollution exposure and cardio- respiratory mortality: a review
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Chemical Industry & Chemical Engineering Quarterly
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European Journal of Public Health
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American Journal of Epidemiology
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Air Quality Atmosphere and Health
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Epidemiology, 19(4): 637.
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The Temporal Pattern of Mortality Responses to Air Pollution: A Multicity Assessment of Mortality Displacement
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Epidemiology, 13(1): 87-93.

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Traffic-Generated Air Pollution and Myocardial Infarction
Rosenlund, M; Bellander, T; Nordquist, T; Alfredsson, L
Epidemiology, 20(2): 265-271.
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Epidemiology
Fixed Factors that Modify the Effects of Time-Varying Factors: Applying the Case-Only Approach
Armstrong, BG
Epidemiology, 14(4): 467-472.
10.1097/01.ede.0000071408.39011.99
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Epidemiology
Traffic-Related Air Pollution in Relation to Incidence and Prognosis of Coronary Heart Disease
Rosenlund, M; Picciotto, S; Forastiere, F; Stafoggia, M; Perucci, CA
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10.1097/EDE.0b013e31815c1921
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Epidemiology
Particulate Matter and Daily Mortality: A Case-Crossover Analysis of Individual Effect Modifiers
on behalf of the SISTI Group, ; Mallone, S; Miglio, R; Pandolfi, P; Rognoni, M; Serinelli, M; Tessari, R; Vigotti, M; Perucci, CA; Forastiere, F; Stafoggia, M; Berti, G; Bisanti, L; Cernigliaro, A; Chiusolo, M
Epidemiology, 19(4): 571-580.
10.1097/EDE.0b013e3181761f8a
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Epidemiology
Long-Term Exposure to Urban Air Pollution and Myocardial Infarction
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Keywords:

air pollution; ambient particles; mortality; time-series; Poisson regression; geographic comparisons

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© 2001 Lippincott Williams & Wilkins, Inc.

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