EPA Tightens Air Quality Standard for Ozone

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 Committee, which unanimously agreed that the level should be lowered to no greater than 0.070 ppm. Both industry and environmental groups appear to be equally unhappy with the new rule, with industry representatives calling the rule unnecessary, and environmental groups saying it is not enough. EPA...

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