Asia-produced ozone 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.

http://news.yahoo.com/s/mcclatchy/20100221/sc_mcclatchy/3431419