Climate Change Threatens Already Poor Air Quality in California’s Central Valley
Union of Concerned Scientists
JULY 26, 2022
This was particularly pronounced during the wildfire seasons of 2020 and 2021, when 4 of the 5 largest wildfires in California’s history burned. During the large fire years of 2018-2020, Fresno experienced 51 high particle pollution days , up from 34 days for the period of 2017-2019. .
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