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A comment on Dust from Car Brakes More Harmful Than Exhaust, Study Finds. Parent comment
Specifically: Leaded gasoline (with tetraethyllead), nitrogen oxides (NOx), sulfur oxides (SOx), carbon monoxide (CO), unburned hydrocarbons.
https://en.wikipedia.org/wiki/Tetraethyllead , https://en.wikipedia.org/wiki/Sulfur_oxide , https://en.wikipedia.org/wiki/NOx
Specifically: Leaded gasoline (with tetraethyllead), nitrogen oxides (NOx), sulfur oxides (SOx), carbon monoxide (CO), unburned hydrocarbons.
https://en.wikipedia.org/wiki/Tetraethyllead , https://en.wikipedia.org/wiki/Sulfur_oxide , https://en.wikipedia.org/wiki/NOx