- They usually use a 2nd strategy
- 1980 A. Wallace of the U.S Environmental Protection agency, launched the first serious efforts to assess everyday exposure of the general population
- the investigations of volatile organic compounds typically tested for some 30 different chemicals
- greatest contact with potentially toxic pollutants not outside but inside the places they usually consider to be essentially unpolluted
- living with a smoker raises one’s exposure to benzene enormously.
- 45 percent of the total exposure of the U.S. population to benzene comes from smoking
- 36 percent from inhaling gasoline fumes
- 16 percent from other home sources
- outdoor levels of carbon monoxide have steadily declined in the U.S.
- U.S. population now receives greater exposure to carbon monoxide indoors than out