The Trump administration on Monday declined to tighten controls on industrial soot emissions, disregarding an emerging scientific link between dirty air and Covid-19 death rates.

In one of the final policy moves of an administration that has spent the past four years weakening or rolling back more than 100 environmental regulations, the Environmental Protection Agency completed a regulation that keeps in place the current rules on tiny, lung-damaging industrial particles, known as PM 2.5, instead of strengthening them, even though the agency’s own scientists have warned of the links between the pollutants and respiratory illness. In April, researchers at Harvard released the first nationwide study linking long-term exposure to PM 2.5 and Covid-19 death rates.

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