Study suggests that fresh asphalt is a significant source of air pollution
Here is the Yale press release:
https://news.yale.edu/2020/09/02/asphalt-adds-air-pollution-...And the paper:
https://advances.sciencemag.org/content/6/36/eabb9785I'd also like to point out that road wear is approximately proportional to the cube (^3) of the weight per axle on a  vehicle, so cars are probably responsible for a minority of this pollution.*edit: some are pointing out that the relevant road wear is proportional to the 4th power of vehicle weight, see the comments below for details.