Environmental Protection Agency (EPA) announced a new review of the Ozone National Ambient Air Quality Standards (NAAQS) to ensure the standards reflect the most current, relevant science and protect people's health from these harmful pollutants. EPA Administrator Michael Regan reached this decision after carefully considering advice provided by the independent Clean Air Scientific Advisory Committee (CASAC). In October 2021, EPA announced a reconsideration of the previous Administration's decision to retain the NAAQS for ozone. EPA is incorporating the ongoing reconsideration into the review announced today and will consider the advice and recommendations of the CASAC in that review. The Agency will move swiftly to execute this new review of the underlying science and the standards – prioritizing transparency, scientific integrity, inclusive public engagement, and environmental justice.