As wildfires continue to tear through the western U.S., scientists reported that particulate matter from the blazes has been linked to an excess of COVID-19 cases and deaths.
The Dixie Fire burns down a hillside towards Diamond Mountain Rd. near Taylorsville in Plumas County, Calif., on Friday, Aug. 13, 2021.John A. Paulson School of Engineering and Applied Sciences and the Environmental Systems Research Institute in Redlands, California – found that wildfire smoke had an impact on COVID-19 cases and deaths for up to four weeks after exposure.
Across all counties, the study found that a daily increase of 10 µg/m3 in PM 2.5 each day for 28 days was associated with an 11.7% increase in coronavirus cases and an 8.4% increase in deaths. Washington's Whitman County showed the largest effect on COVID-19 cases, with the percentage of total cases attributable to high levels of PM 2.5 of wildfire days at 18.2%.
Additionally, Calaveras, California, showed the largest effect on coronavirus deaths with a percentage of total COVID-19 deaths attributable to high levels of PM 2.5 on wildfire days at 137.4%. wreaked havoc last year – topped the list for both percentages, with 17.3% of total cases attributable to high levels of PM 2.5 on wildfire days and 41% of total COVID-19 deaths attributable to high levels of PM 2.5 on wildfire days.
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