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The Health Effects Institute

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Report Reveals U.S. States with Highest Ozone Air Pollution in 2025

October 30, 2025

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According to the U.S. Environmental Protection Agency (EPA), exposure to ozone can cause coughing, throat irritation, breathing difficulties, and airway inflammation.

The State of Global Air 2025 report has revealed which U.S. states and regions record the highest levels of ozone…