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> The exhaust used to be really nasty

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




Don't forget about the solid particles.




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