How purple became a cautionary color on the Air Quality Index : NPR
[ad_1] A version of this story originally ran on Feb. 5, 2021 A person walks by the Washington Monument at dusk through hazy skies caused by Canadian wildfires on June 7, 2023 in Washington, D.C. Drew Angerer/Getty Images hide caption toggle caption Drew Angerer/Getty Images This week, millions of Americans are anxiously scanning air quality…
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