States weigh in on ozone rule.

In the article, the author discusses developments in the proposed reduction of allowable ground-level ozone limits in the U.S. as of early October 2015. Based on a study by the Association of Air Pollution Control Agencies (AAPCA), state air regulators want the Environmental Protection Agency (EPA) to improve its implementation direction on the proposed rule. Also cited is the comment by AAPCA executive director Clint Woods on the issue.