1/4 of cars cause 9/10 of pollution

Researchers at the University of Toronto found that “badly tuned” cars are responsible for most of the air pollution

But in a paper published in the recent edition of the journal Atmospheric Pollution Research, U of T chemical engineer Greg Evans (ChemE) and his partners at Environment Canada have found that concentrations of pollutants from traffic are still double at a distance of 280 metres downwind from highway 400 north of Toronto.