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Articles like this, is what I was referring to.
https://www.wired.com/2008/06/motorcycles-pol/
Which references
https://www.latimes.com/news/la-hy-throttle11-2008jun11-story.html
That appears to state yes they meet criteria to pass the tests, but that doesn’t mean they are environmentally friendly. That’s the States not London.
pdlouche
NOx aren't issues on motorcycles, hence why most bikes, even two strokes, pass NOx emissions for the Ulez.