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The Lane Regional Air Protection Agency has issued an air quality advisory through Saturday.

More than 150 million people in the United States live in areas affected by harmful levels of air pollution.

NPR's Martin Kaste continues the week-long series on Latin American cities with a report on Buenos Aires, Argentina. Since Argentina's economy collapsed in 2001, there have been great disparities in wealth and widespread corruption throughout Buenos Aires.

New York Times writer Dan Crane talks about his book, To Air is Human, his stage name, Björn Türoque, and how he relinquished his guitar to become the second greatest air guitarist in the nation.

NPR's Ned Wharton captures reactions to the shuttle Columbia disaster from visitors at the National Air & Space Museum.

The government shutdown is over, but airports are still getting back up to speed, after reductions in air traffic controllers led to thousands of flight delays and cancellations around the country.

NPR's Ned Wharton captures reactions to the shuttle Columbia disaster from visitors at the National Air & Space Museum. (This is a repeat from earlier in the show.)

The Environmental Protection Agency tells officials in 31 states that new air-pollution controls are needed to control smog in counties containing more than 150 million people. The EPA, acting under court order, said 474 counties have air that fails federal standards or contributes to pollution in a neighboring area. NPR's Allison Aubrey reports.

The "Queen of Soul" spoke to Fresh Air's Terry Gross about life and music in 1999.

NPR's Nina Totenberg reports on today's arguments before the Supreme Court on the constitutionality of the 1970 Clean Air Act. Opponents from industry and several state governments say Congress unconstitutionally delegated too much of its power to the executive branch. The measure requires the Environmental Protection Agency to establish air quality standards that protect the public health, based on the latest science. Defenders of the law say Congress could never agree on standards, and is justified in assigning the job to the EPA.