National Public Radio: AUDIE CORNISH, HOST: From NPR News, this is ALL THINGS CONSIDERED. I'm Audie Cornish. ROBERT SIEGEL, HOST: And I'm Robert Siegel. Today, the Environmental Protection Agency proposed a new rule to clean up gasoline. The regulation would reduce ozone and other air pollutants by close to 30 percent. That would benefit 100 million people who now live in areas that at times have unhealthful air. NPR's Richard Harris reports. RICHARD HARRIS, BYLINE: Even though automobile emissions have improved a...