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.

Joel Schwartz submitted comments to EPA on the agency’s proposal to lower the 24-hour PM2.5 standard from 65 mg/u3 to 35 mg/u3.

The authors explore using science to justify policy decisions by analyzing the EPA's revised air quality standards for ground-level ozone and particulate matter.

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

The president was quick to embrace the Keystone delay to 2013, as it will spare him the need to either approve the pipeline, infuriating environmentalists, or kill it, infuriating everyone else. Whether one views such a move as cowardly or as pragmatic, it’s indisputably foolish.

Air pollution is at a historic low and affects far fewer people, far less often, and with far less severity than activists care to admit.

Policies enacted over the last few decades have systematically eroded the ability of manufacturers to earn returns on certain drugs, especially older parenteral drugs sold as generics. We need to reform the policies governing these markets if we're going to lure investment back into these important areas.

With gas prices soaring, we can't ignore the success of horizontal hydraulic fracturing of shale gas and the profound importance of natural gas on America's energy future.The availability of cheap natural gas is expected to continue well into the future.