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The difference between emission levels across the sites was more correlated with the number of large trucks on the road rather than number of cars.
Researchers found that air pollution levels right beside a major trucking route within a city were close to levels seen beside Highway 401, despite the road carrying less than one-tenth of the vehicle traffic. “This was in part due to differences in wind and proximity to the road but, surprisingly, the number of vehicles didn’t make that much of a difference,” said Evans.
The data also revealed a significant drop in emissions on the 401 on the weekends, when personal vehicle traffic is still very high, but the volume of large truck traffic is low.
Researchers found that air pollution levels right beside a major trucking route within a city were close to levels seen beside Highway 401, despite the road carrying less than one-tenth of the vehicle traffic. “This was in part due to differences in wind and proximity to the road but, surprisingly, the number of vehicles didn’t make that much of a difference,” said Evans.
The data also revealed a significant drop in emissions on the 401 on the weekends, when personal vehicle traffic is still very high, but the volume of large truck traffic is low.
