The US Environmental Protection Agency Thursday finalized rules directing 20 US states to slash levels of tiny particles spewed by power plants, cars and other sources by 2010. About 88 million people in more than 200 counties -- mostly clustered around big cities like Los Angeles and New York -- live where "particulate" levels exceed legal limits set by the agency. The offending particles -- 30 times smaller than the width of a human hair -- are linked to premature ... Reuters: http://www.planetark.com/dailynewsstory.cfm/newsid/41162/story.htm