21.   And they would push hundreds of counties with relatively clean air into noncompliance.

22.   And, behold, clean air in the press box.

23.   Antelope and clean air, a sense of history and a sense of place.

24.   As a nation with laws and policies that promote clean air and clean lungs, we are now running backward.

25.   As a result, his nomination is shaping up as the latest battleground in the regional war over acid rain and other policies affecting clean air.

26.   As an advocate of limited government, Bush believes that lawsuits and regulations are not the best way to achieve clean air and water.

27.   At issue are environmental debates over global warming, carbon dioxide, and domestic clean air policies.

28.   At the same time, the Senate also approved by voice vote an amendment that would give states up to three years to comply with new clean air standards.

29.   Babbitt campaigned for clean air.

30.   Because of stronger winds and cleansing storms credited to El Nino, Southern California may post the best year for clean air in decades.