On Aug. 7, 2001, the New England Governors Conference weighed in on the debate over MTBE and ethanol, sending a resolution to Congress asking it to drop rules under the Clean Air Act.

The TipSheet of August 29, 2001, erred in implying that former Ohio EPA chief Donald Schregardus opposed the US-EPA's enforcement initiative against Ohio power plants under the Clean Air Act's New Source Review provisions.

Is the air inside airplane cabins unhealthful? Federal Aviation Administration should undertake rigorous research to better identify problems and solutions.

The closure of U.S. airports following the terrorist attacks of Sept. 11, 2001, provides a rare opportunity to gauge the contributions of airports and related activities to a city's air pollution.

A likely upcoming shift in California's strategy to reduce smog from cars could affect new vehicles rolling onto roads nationwide over the next few years.

New Jersey filed a lawsuit Feb. 19, 2008, challenging the US-EPA's December 2007 rule that utilities could decide for themselves whether their air pollution increases are significant enough to require detailed record-keeping.

EPA still has not complied with requests from two Congressional investigating committees for documents on its decision to deny California and some 16 other states waivers allowing them to regulate tailpipe greenhouse emissions.

Henry Waxman (D-CA), the chairman of the House Oversight Committee, has vowed to investigate EPA's decision to prohibit states from regulating greenhouse emissions.

EPA has proposed exempting farms from a law protecting the public from toxic air pollutants. Environmental groups have objected.