EPA Proposes Stricter Ozone Air Standard Based On Public Health Threats

EPA is proposing to tighten its national ambient air quality standard (NAAQS) for ozone to a range between 65 and 70 parts per billion (ppb) in order to adequately protect human health against harm from ozone, a limit that would be stricter than the existing 75 ppb standard and is already prompting major industry and GOP push-back. Separate from the “primary” health-based standard revision, EPA is also proposing to protect the environment through tightening its “secondary” environment-based standard by defining...