3 ms·

Hmm. According to this https://www.epa.gov/sites/production/files/2015-09/documents/sbai_pres.pdf https://www.epa.gov/sites/production/files/2015-09/documents..

by llukas 9y ago

Hmm. According to this https://www.epa.gov/sites/production/files/2015-09/documents/sbai_pres.pdf https://www.epa.gov/sites/production/files/2015-09/documents... Most particulates are from exhaust but amount of this is falling and soon most contributing factor would be brake/tire wear.

hollerith 9y ago
That's why I used the qualifier "gasoline-fueled": the particulates are coming mostly from _diesel_ engines. (I didn't belabor that point earlier because I assumed that people here would already know that because the VW diesel-emissions cheating scandal was such a big story.) During a busy commute in a major US metro area, the vast majority of the vehicles on the road are gas-powered (because a large fraction of trucks will avoid busy commutes). I realize the situation is different in Europe where diesel-powered cars are much more common.