US air pollution worsens, California cities most affected

Summary: A new report reveals nearly 40% of US residents face unhealthy air pollution levels, with California hosting four of the top five polluted cities. Over 131 million people are exposed to harmful ozone and particle pollution, a rise of 11.7 million from the previous year. Climate change impacts millions annually, leading to health risks. Recent EPA data shows a 78% drop in emissions since 1970, but wildfires are reversing progress.

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