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New EPA regulations take effect this year for motorcycles. The *limits* are still several times higher than those for cars, but it's still not much (i.e. 3 ppm/mi for cars, 9 ppm/mi for motorcycles).
Comparison is tough because motorcycles are measured for hydrocarbon + NOx, unlike cars which have separate hydrocarbon and NOx measurements. It's entirely possible that motorcycles may emit well under the EPA limits, since some places (i.e. California, Europe) have even more stringent emissions limits.
Environmental vegans - judgemental and uninformed. What a surprise.
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