Harvard study aims to boost case for stricter PM NAAQS

A new study by the Harvard School of Public Health aims to bolster the case for EPA to tighten its fine particulate matter (PM2.5) national ambient air quality standards (NAAQS), citing new evidence on adverse health impacts by PM2.5 that the researchers say justifies a stricter NAAQS to adequately protect human health. “The Environmental Protection Agency has proposed retaining current national air quality standards. But, as our new analysis shows, the current standards aren’t protective enough, and strengthening them could...