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New report claims only seven countries had healthy air quality that met World Health Organisation guidelines for PM 2.5 values in 2023.

Columbus, Ohio, was the most polluted major U.S. city for the second year running.

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 ...

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.

Two recent reports underscore the urgency of collective action to curb emissions.