04/25/2010 05:12 am ET | Updated May 25, 2011

Asia Ozone Pollution Making Its Way To U.S., Study Finds

WASHINGTON -- A new study further bolsters concerns that pollution blowing across the Pacific Ocean from China and other rapidly developing Asian nations may swamp efforts to clean up the air in the Western United States and make it difficult for states and cities to meet federal standards.

The study, based on 100,000 measurements over 25 years and a computer model tracking air-flow patterns, found that during the spring, ozone from Asia reaches Washington, Oregon, California and other states west of the Rocky Mountains.

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