21.   Indoor air pollution has consistently ranked among the top five environmental risks to public health in recent studies conducted by the EPA and the Science Advisory Board.

22.   Indoor air pollution costs American businesses tens of billions of dollars a year in health care and lost work, the Environmental Protection Agency estimated.

23.   Instead, it replaces the hot indoor air with fresh air from the outdoors.

24.   Indoor air stifled.

25.   It also said it would adopt American standards for indoor air quality and would expand its independent monitoring system.

26.   Lurking inside is indoor air pollution, in the form of mold, mildew, chemicals, dust and dust mites.

27.   Nadler emphasized that he had no firm evidence that downtown residents and workers had ever been at risk from indoor air contamination, or that they were now.

28.   New indoor air regulations being developed by OSHA will mostly focus on passive smoke, she said.

29.   Now researchers are looking to houseplants for a solution to polluted indoor air.

30.   OSHA is also developing new rules on indoor air quality, including protection from secondhand smoke, that business interests complain would add to their costs.