Covid led to cleaner air around the world, but not in Oregon

A new global air pollution report for 2020 highlights the profound effect the Labor Day wildfires had in Oregon. “Because of devastating wildfires, during September 2020 numerous U.S. cities constituted a remarkable 77 of 100 of the world’s most polluted cities for PM2.5 by monthly average,” the report by the Swiss air-monitoring company IQAir said. “These were located in California (35), Oregon (35) and Washington (7).” As a result, most Oregon cities in 2020 saw big annual average increases…
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