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World News and Views :: Top of the News EPA Tightens Air Quality Standard for Ozone8:52 AM MDT | March 13, 2008 | Michelle Bryner EPA has tightened its national ambient air quality standard for smog-forming ozone, reducing the eight-hour standard to 0.075 parts per million (ppm), from 0.084 ppm. The new standard falls short of recommendations from EPA’s Clean Air Science Advisory... This information is only available to Forgot your user ID or password?
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