EPA Proposes Rule to Revise National Ozone Standard

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The U.S. Environmental Protection Agency (EPA) announced on Thursday its proposed revisions to the National Ambient Air Quality Standards (NAAQS) for ozone (O3).1 EPA seeks to revise the existing ozone standard of 0.075 parts per million (ppm) that was previously set in March 2008 during the Bush Administration. The rulemaking would tighten the 2008 standard by setting the 8-hour primary standard for ozone at a level between 0.060 and 0.070 ppm. EPA also proposes to add a secondary ozone standard that is intended to “protect the public welfare”2 and safeguard plants and trees from damage from repeated ozone exposure.

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