California Faces Heaviest Burden Attaining EPA’s Tighter PM NAAQS

January 6, 2023
EPA’s proposal to toughen national ambient air quality standards (NAAQS) for fine particulate matter (PM2.5) would likely pose the heaviest compliance burden on California and a few hot spots in the Mountain West, which would struggle to attain the standards, with most of the rest of the country already meeting the new limits, according to EPA’s analysis. EPA’s Regulatory Impact Analysis (RIA) released alongside the agency’s Jan. 6 proposed rule shows that under several regulatory scenarios analyzed, California is likely...

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