11.   The men breathe air that is filtered to remove any radioactive dust, nerve gases or biological toxins.

12.   Whales, like all mammals, breathe air and give milk.

13.   You needed millions to breathe this air.

14.   No American should have to drive out of town to breathe clean air.

15.   He wants to live where he can breathe clean air.

16.   And, also like many others, she began to wonder about the water she drank and the air she breathed.

17.   As far as the cancer risks go, he said, everyone who lives in the South Coast basin gambles every day they breathe the air.

18.   As many as half of all patients whose lungs are damaged by breathing super-heated air develop pneumonia, which can be lethal, doctors said.

19.   Because the eels breathe air, they can survive long dry spells.

20.   Breathing this air can introduce dangerous substances into the lungs.