Can you provide data on motorcycle engines? I do believe this to be true for 2-strokes and older motorcycles, but for modern Euro-4/5 regulated street motorcycles I very much doubt it.
Carbon emission has an almost direct relationship to the amount of fuel burned, so assuming single occupancy, even older motorcycles do fair better than most cars in that respect.
Particulate and NOX emission, not so much.
Bikes didn't require catalysts for a long time. And they often used less-precise fueling systems, like carburetors. But that has changed or is changing in a lot of places more recently.
jascii|5 years ago
bradlys|5 years ago
A statistic for CA was motorcycles make up 1% of my miles driven but 10% of smog pollutants.
kube-system|5 years ago