Springtime ozone increases over Western North America linked to emissions abroad

Springtime ozone levels above western North America are rising primarily due to air flowing eastward from the Pacific Ocean, a trend that is largest when the air originates in Asia. These increases in ozone could make it more difficult for the United States to meet Clean Air Act standards for ozone pollution at ground level, according to a new international study. Published online Wednesday, Jan. 20, in the journal Nature, the study analyzed large sets of ozone data captured since 1984.

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