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Air pollution in New Delhi is at least four times the safe levels according to World Health Organization guidelines.

This rule means more truck manufacturers will have to make cleaner vehicles with the aim of reducing greenhouse gases and air pollution.

President Bush marks Earth Day with a visit to the Great Smoky Mountains -- America's most-visited national park and one of its most polluted. The president will use the park as a backdrop for promoting policies he says will result in cleaner air and water. Environmentalists say he is actually weakening regulations.

An investigation into possible security breaches at the military base at Guantanamo Bay continues. An Air Force translator and a Muslim Army chaplain who worked at the U.S. prison camp for terrorism suspects are both in custody, though the chaplain has not been charged. The translator is facing 32 criminal charges, including espionage and aiding the enemy. This story of Muslims in the U.S. armed forces accused of disloyalty reminds commentator Askia Muhammad of his own military past.

An Environmental Protection Agency study concludes that water and air quality and environmental safeguards are better today than they were 30 years ago. Answering skeptics, outgoing EPA chief Christine Todd Whitman says the Bush administration's decision to edit sections on the effects of global warming was motivated not by censorship but by differing opinions from government scientists. NPR's Melissa Block speaks with Whitman.

Every summer millions of Americans pack their bags and hit the highways in recreational vehicles. With many Americans fearing air travel, industry groups say RV travel is more popular now than ever. For All Things Considered, reporter Brian Mann visits Vermont's Shelburne Museum, which has an exhibit celebrating the history and culture of the RV lifestyle.

It's been over 30 years since David Bowie created the gender-bending Ziggy Stardust, and produced the now classic album The Rise and Fall of Ziggy Stardust and the Spiders from Mars. On Tuesday, the musician and songwriter will receive a 2006 Lifetime Achievement Grammy Award.

Delta Air Lines and its pilots' union have reached a tentative agreement on a new labor contract, according to a federal mediator. No details of the deal have been announced, but the company was seeking significant cuts in pay and benefits to reduce its cost. Delta pilots will vote on the tentative deal.

Comedianne and actress Mo'Nique hosts the first televised beauty competition and boot camp for full-sized women. Fat Chance airs on the Oxygen Network this weekend. The funny lady and actress talks about being a role model for those with dress sizes 14 and up.

The space shuttle and its seven-person crew make a safe landing at Edwards Air Force Base in California, successfully conclucing the first shuttle mission since the Columbia disaster. The shuttle was diverted from a Florida landing by bad weather.