11.   The filtration system provides the crew with clean air free from fumes.

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

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

14.   Clean air is a valuable natural resource that needs to be protected.

15.   He also promised clean air legislation and negotiations on a cross-border acid rain accord.

16.   Between the calls, he went and hung out of the casement, in shirt and trousers, bare-footed, and breathed the sweet clean air.

17.   The US administration is planning to weaken a provision in the clean air laws designed to preserve air quality in unpolluted areas.

18.   Among them are laws on fair housing, drug-free workplaces, clean air, child abuse, ocean dumping and highway safety.

19.   Among the issues they will discuss is clean air and environmental legislation, welfare reform, unfunded state mandates, transportation and infrastructure and Medicaid reform.

20.   And his aides have begun to signal that Gore was weighing in behind the scenes for a decision on clean air standards that would satisfy the environmentalists.