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WASHINGTON (AP) - The government on Thursday announced new limits on how many tiny particles of soot that people safely can breathe each day, rejecting tougher standards recommended by its own experts.
The Environmental Protection Agency kept some of its 1997 standards for soot particles — those smaller than 2.5 micrometers, or one-thirtieth the diameter of a human hair — that lodge in the lungs and blood vessels.
Experts advising the agency had said that the science supports tougher standards than EPA chose. Other air pollution experts and advocates complained of political tinkering.
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