Hundreds of U.S. countries fail ozone standards


  • Randy Showstack


About 159 million residents live in the 474 U.S. counties that either do not meet the 8-hour standard for ground-level ozone, or cause a downwind county to fail meeting the standard, the U.S. Environmental Protection Agency announced on 15 April.

Eighteen entire states met the standard. EPA also announced a new rule to classify areas by the severity of ozone conditions, and a set of Clean Air Rules of 2004 to help states and counties meet the standard.