No, fully aware that this study was in Toronto, but if it's remotely indicative ...

madaxe_again on May 7, 2015 | parent | context | favorite | on: 25% of Cars Cause 90% of Automobile Air Pollution

No, fully aware that this study was in Toronto, but if it's remotely indicative of the variation of the environmental damage car emissions cause, then the problem is vastly exacerbated by old and poorly maintained vehicles driven in less wealthy and/or impoverished parts of the world.