In October 2015, EPA lowered both the primary (health-based) and secondary (welfare-based) NAAQS for ozone from the 2008-set 75 parts per billion (ppb) to 70 ppb, even though the higher 75 ppb standard was never fully implemented across the country. The 2015-set ozone standard is forcing a significant number of states that are currently “in attainment” to “non-attainment” status.
While the new ozone standard was set on Oct, 1, 2015, there remain a host of issues that could undermine compliance efforts by states and localities.
The legislation, which ACA supported, would give the U.S. Environmental Protection Agency (EPA) an additional eight years to determine which areas of the country do not meet the 70 parts per billion ozone standards set in 2015.
EPA has acknowledged that although the new ozone standard was set on October 1, 2015, there remains a host of complex issues that could undermine associated compliance efforts by states and localities, and had already delayed compliance by one year, to October 2018.