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Which U.S. state contains the cities with the poorest air quality in America?

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California dominates the American Lung Association's list of cities with the poorest air quality in America. In fact, California contains the nation's worst four cities for ozone pollution, worst five cities for year-round particle pollution, and worst two cities for short-term particle pollution. This is in spite of the states' aggressive environmental policies, which are commonly praised as the best in the nation.




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