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1. AIR POLLUTION

EPA to launch internal investigation into tests on human subjects

U.S. EPA's inspector general is launching an investigation into research conducted in the past two years that exposed subjects to potentially dangerous levels of air pollution. Carolyn Copper, EPA's assistant inspector general for program evaluation, said in a previously unreleased Oct. 22 letter that the evaluation focuses on experiments from 2010 and 2011 that tested the effects of fine particulates, or PM 2.5, and diesel exhaust on humans.

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