11.   Duncan originally proposed a bill to regulate indoor air quality that had exempted tobacco smoke, but the council added it to the measure.

12.   Environmental groups offer suggestions for keeping indoor air cleaner.

13.   Few people are aware that indoor air can be more polluted than outdoor air.

14.   He also said Nike would develop safer solvents and adopt U.S. standards for indoor air quality in shoe plants.

15.   He is helping companies rethink ventilation, spurred in part by energy saving and indoor air quality.

16.   In buildings with ductwork that can collect indoor air and send it past the refrigerant coils, heat pumps can also serve as air conditioners.

17.   In fact, many companies are becoming increasingly concerned with indoor air quality, and they often view perfumes as part of the problem.

18.   In general, there are three basic strategies to employ in controlling indoor air pollution.

19.   Indoor air is relatively free of pollen if windows are kept closed.

20.   Indoor air quality studies are under way at the Research Triangle Institute in North Carolina and universities throughout the country.