Today the EPA released its proposed update to the air quality standards for ground-level ozone. The proposal lowers the ground-level ozone standard from 75 parts per billion, where it’s been since 2008, to a range of 65 to 70 parts per billion. EPA estimates most areas will be in compliance with the standard by 2025.
A revised ozone standard of 70 to 60 parts per billion was recommended by the Clean Air Science Advisory Committee, a scientific panel that advises EPA in setting the national ambient air quality standards...