21.   The commercials open with a picture of McCain superimposed over smokestacks belching dirty air.

22.   The dirty air contained tiny particles of dust, smoke and other pollutants.

23.   The federal government also blocked federal funds to build new highways in metro Atlanta because of an insufficient plan to clean up the dirty air.

24.   The groups charge that campaign contributions are the dirty secret behind the dirty air, and they zeroed in on Rep. J.D. Hayworth, R-Ariz.

25.   The Lone Star State has dirty air, lax regulators, and does a lousy job of giving poor kids health care.

26.   The new rules would spell out how cities would be categorized according to the severity of their polluted air and establish timetables for cleaning up their dirty air.

27.   The number of Americans living in areas with dirty air has dropped by a third in five years.

28.   The president said the source of the dirty air in the Big Bend is in Texas.

29.   The reason, say Common Cause, Az. Citizen Action and other groups, is that dirty money lurks behind the dirty air.

30.   The secret is that most autos and light trucks on the road contribute the least to vehicular pollution, the prime component of dirty air.