Nearly Half of US Breathes Unhealthy Levels of Pollution—Cars and Trucks Largely to Blame
Union of Concerned Scientists
MAY 21, 2025
Another regulation that is being challenged is the California-based Heavy-duty Omnibus rule , which requires new heavy-duty engines to achieve a 75 percent reduction in NO x emissions, on average, compared to the current federal standards that have been in effect since 2010. and ozone in central and eastern states.
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