Chicago’s air quality has improved after last week’s wave of Canadian wildfire smoke, but experts warn the threat may not be completely gone, especially indoors.
The Windy City dropped significantly on IQAir’s list of the world’s worst air quality cities, falling from near the top of the rankings last week to No. 44 Tuesday. While no U.S. cities remained in IQAir’s global Top 10, experts say clearer skies do not necessarily mean cleaner indoor air.
