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For exhaust emissions, motorcycles are often dramatically worse than modern vehicles with catalytic converters.

https://gearjunkie.com/motors/motorcycle-vs-vehicle-emission...



Of note, that article was mostly highlighting older motorcycles as dramatically worse when comparing them to newer vehicles.

See this article to show how a modern motorcycle would be ~100x less polluting than the example vehicle given in the article referenced:

https://www.acem.eu/new-euro-5-environmental-standard-for-mo...


Does that include motorcycles that have illegal aftermarket exhaust systems with all emission controls removed in an effort to make them as loud as possible? This accounts for about 80% of them, so it's irrelevant how they function by design.




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