Air

"About 50 medical waste incinerators nationwide will have to reduce their air pollution under new regulations announced Wednesday by the Environmental Protection Agency."

"The World Meteorological Organisation said Wednesday that the ozone hole is expected to be smaller in 2009 than a year ago."

"The Obama administration signaled Wednesday that it would scrap a controversial Bush-era rule that set stricter limits for smog but fell short of scientific recommendations."

Intensified monitoring for toxics in the air around certain schools has only raised more questions about health effects -- and some lawsuits.

"An important opposition deputy this week accused Chile's government of being less than candid with the public about alarming levels of fine particulate pollution found in the nation’s leading cities."

"The United States and Canada are nearing an international agreement to clean up the emissions of ships traveling within 200 nautical miles of shore."

"Government scientists who study the depletion of Earth’s protective ozone layer are pointing to a previously unheralded culprit: nitrous oxide."

The Justice Department and Illinois are suing Midwest Generation, charging the utility company with evading the Clean Air Act by not installing pollution controls when modernizing its plants. The move marks an Obama administration reversal of Bush policies.

An aging fleet of coal-fired power plants continue to pollute many urban areas. They were exempted from pollution-control requirements of the 1977 Clean Air Act. Companies rebuild them over and over to avoid installing pollution-control equipment. "The clunkers of the power-plant world" may once again escape new rules and modern technology.