ADVOCACY:  

REGULATION OF OZONE UNDER CLEAN AIR ACT

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Background:

Under the National Ambient Air Quality Standards (NAAQS) program, the U.S. Environmental Protection Agency (EPA) sets air quality levels that it deems necessary to protect the public health and welfare. States then issue State Implementation Plans (SIPs) that put measures in place to improve air quality in areas that do not meet the standards (nonattainment areas) or to maintain air quality in areas that do (attainment areas). These obligations are permanent and continue even after an area has achieved the NAAQS. EPA reviews the NAAQS every five years and revises the standards as needed.

Even though States are still working to attain the 2008 standards of 75 parts per billion (ppb), EPA lowered the ozone NAAQS to 70 ppb in 2015. If EPA moves forward with implementing the 2015 standards, States would face overlapping and redundant implementation requirements for the 2008 standards and the 2015 standards.