Quick: How many kinds of gasoline do we use in America? Most people would say three or six: regular unleaded, mid-grade, and premium, along with the ethanol blends of the same that have become nearly universal. The actual number is somewhere above 45, though hard to pin down exactly, according...

The controversy over the Clean Air Act is worth understanding because it reveals a pivotal development that EPA and the environmental groups would prefer to conceal: the 40-year-old act is no longer a sensible way to regulate large-volume conventional air pollutants such as ozone and particulate matter.

Visiting scholar Joel Schwartz available for comment on the State of the Air 2007 report.

The Environmental Protection Agency's forthcoming designation of more than 300 counties as "non-attainment" areas for the new ozone air-quality standard is bound to raise public concern that air pollution is getting worse and that it presents a significant health threat. In addition, spring is a time when advocacy groups release...

The findings in Digging Up Trouble by the Union of Concerned Scientists are unreliable and based on flawed methodology and analysis.

This annual report highlights significant environmental developments and milestones in the United States and worldwide.

Air pollution affects far fewer people, far less often, and with far less severity than suggested by media and activist reports.

CARB's new ozone standard will cause net harm to Californians.