GRA
Well-known member
https://www.greencarcongress.com/2019/10/20191001-pan.html
. . . while long-haul trucks account for less than 6% of the vehicle miles traveled over US highways, they account for about 40% of the emissions of air polluting particulate matter and about 55% of nitrogen oxides, the precursor to ozone in the atmosphere, the study said . . .