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Gilbert-L, N*; Goldberg-S, M†; Brook-R, J‡; Jerrett, M§
*Health Canada, Canada; †McGill University, Canada; ‡Environment Canada, Canada; and §University of Southern California, United States.
The objective of these analyses was to determine whether highways significantly influence ambient concentrations of nitrogen dioxide (NO2) at distances greater than 200 m.
NO2 was sampled for 14 consecutive days in May 2003 at 67 sites across Montréal, Canada. The association between logarithmic concentrations of NO2 and land-use variables was assessed using multiple regression. Locations less than 100 m from the nearest highways were excluded, leaving 61 data points. Then, locations less than 200 m were excluded, leaving 55 data points.
Excluding sampling locations located less than 100 or 200 m from the nearest highway did not substantially change the regression parameters. NO2 remained significantly associated with both the distance from nearest highway and the traffic count on the nearest highway.
The negative association found between distance from highways and NO2 concentration in previous land-use regression studies was not generated solely by the high concentrations found in the immediate vicinity of highways.
© 2007 Lippincott Williams & Wilkins, Inc.
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