61.   Administration officials say their decision was a matter of air quality and current law, not politics, explaining that ethanol allows gasoline to burn more cleanly.

62.   Air quality is one example.

63.   Air quality was dusty, but clear enough to see for miles.

64.   Air quality, in particular, is complicated.

65.   Air quality and water quality surrounding metro Atlanta.

66.   Air quality, too, could be measured, he said.

67.   Air pollution is enough of a problem in the Miami Valley that the American Lung Association gave the Dayton area an F in air quality last May.

68.   Air quality becomes less of an abstraction every day as the validity of global warming gains credibility.

69.   All the prisoners interviewed complained of the air quality in the cells and the buildup of concrete dust from the unpainted walls. . . .

70.   Bush has defended his record on air quality by citing data showing some declines in toxic emissions.