Study shows why Eastern US air pollution levels are more stagnant in winter

The air in the United States is much cleaner than even a decade ago. But those improvements have come mainly in summer, the season that used to be the poster child for haze-containing particles that cause asthma, lung cancer and other illnesses. A new study led by the University of Washington shows why winter air pollution levels have remained high, despite overall lower levels of harmful emissions from power plants and vehicles throughout the year.

Provided by University of Washington

Runtime: 0:57

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