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Dust from tires.
There was an air-quality researcher who tried getting samples in Toronto, of pollen.
He couldn't find the pollen.
Only tires-particles.
The significance of the changes in tires, since the 1970's, is astonishing.
What tires can do, nowadays, .. outright unbelievable, compared with way back when.
Look at how far over modern bicycle-racers can lean, compared with images of the old races, when their tires hadn't anywhere near the grip they've got now..
but they're still being poured into the atmosphere at stunning rate..
All the wear of your tires, as the tread gets thinner, its going into the ecology, either the air or the waters or the land around the roads,
& then you've got the oceans-of-used-tires which often can't be recycled, or cost too much to be recycled..
There has been extensive study on this stuff, btw, dig a bit & you'll find some in-depth stuff!