Smoke from forest fires in Canada significantly increased the levels of dangerous fine particulate matter in cities in the Midwest and Northeast.
Chicago skyline and power lines along Halsted Street near Chicago Avenue, during the second straight day of hazy and poor air quality conditions on Wednesday, June 28, 2023. Chicago ranked second among major U.S. cities with the worst air pollution in 2023, its average annual concentration of dangerous fine particulate matter almost three times global guidelines, according to a recent report. Even as national standards have tightened, pollution levels in the city still surpassed old regulations.
“Historically, we have never seen anything like this in our region,” said Krista Thomason, a physical scientist with Region 5’s Air and Radiation Division, who participated in a panel Wednesday on Midwestern air quality. “The western portions of the United States do deal with this more frequently, but for us, it’s a pretty rare phenomenon.”
Because of time differences and depending on the number of monitors in a city, an average worldwide index might not paint a complete picture, according to experts such as Trent Ford, the Illinois State climatologist. Concerns about wildfire smoke can compound Chicago’s existing problems with pollution, especially in neighborhoods and parts of the city historically affected by heavy industry.
As smoke hits Chicago again, experts say climate change is increasing the severity and reach of Canadian wildfires
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