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ARTICLE · 13 NOVEMBER 2020

COVID-19 And PM2.5 Are Still Not A Healthy Mix

In April, I noted that researchers at the T.H. Chan Harvard School of Public Health had identified a relationship between PM-2.5 exposure and mortality from COVID-19.

United StatesEnvironment

In April, I noted that researchers at the T.H. Chan Harvard School of Public Health had identified a relationship between PM-2.5 exposure and mortality from COVID-19.  That study received some criticism, and it certainly did not move the Clean Air Science Advisory Committee to alter its recommendation to keep the PM2.5 NAAQS unchanged at 12 ug/m3.

Earlier this month, the same researchers updated the study, finding the link between PM2.5 exposure and COVID-19 mortality to be even stronger than they initially thought.

We found that higher historical PM2.5 exposures are positively associated with higher county-level COVID-19 mortality rates after accounting for many area-level confounders. The results were statistically significant and robust to secondary and sensitivity analyses.

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