The Clean Air Act requires the U.S. Environmental Protection Agency to set National Ambient Air Quality Standards for pollutants considered harmful to public health and the environment. EPA recently reviewed the National Ambient Air Quality Standards for Ozone and proposed to strengthen them to a more protective level. The new ozone standard is an 8-hour average concentration of 75 parts per billion. Based on this revised standard, all states must evaluate areas for compliance with the ozone standard. The outcome of the designation process will be a recommended list of counties in the state that currently monitor or are contributing to 8-hour ozone violations.