Report or Study:  Harder to Breathe: Air Quality Has Worsened Since 2016
In the U.S., annual average levels of fine particulate matter — PM2.5 — declined 24% from 2009 to 2016, then increased 5% between 2016 to 2018.
Topics:  Air Quality, Climate Change, Fracking / Gas Development, Public Health
Report or Study Link: https://www.nber.org/papers/w26381
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