11.   A.C. opted to disconnect his electronic air cleaner and replace it with a high-efficiency media filter.

12.   All of this could mean cleaner air but slightly more expensive gas and automobiles.

13.   Allan Hirsch, a spokesman for the Air Resources Board, said surveys have shown that Californians are willing to pay more at the pump for cleaner air.

14.   But despite the smaller size of the House-approved program, supporters said the action was still a major step toward cleaner air in Texas.

15.   But Bush says the state is making progress toward cleaner air.

16.   But the country long ago said that it was willing to pay for cleaner air.

17.   But the warm-water fishing and cleaner air may be some of the last positive spin for El Nino in California, if predictions hold.

18.   But there are billions of dollars in additional tax breaks that offer no apparent yield in terms of efficiency or cleaner air.

19.   By itself, a stricter standard will not deliver cleaner air.

20.   Cleaner air.