Chicago ranked 2nd for worst air pollution in 2023 among major US cities, global report says

CHICAGO — 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. At one point last summer, Chicago had the poorest air ...

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