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Denver ranks 8th worst for ozone pollution despite Fort Collins being the cleanest for particles.
The American Lung Association’s 2026 report shows Colorado's Denver-Aurora metro area ranks 8th worst in the nation for ozone pollution, with over 220 high-ozone days annually.
While Fort Collins-Loveland ranked best for short-term particle pollution, the Denver area also ranked high for year-round particle pollution, highlighting a mixed air quality profile despite the state's reputation for clean air.
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Denver ocupa el octavo lugar en la peor contaminación por ozono a pesar de que Fort Collins es el más limpio para las partículas.