Some years ago, the US Environmental Protection Agency (EPA), working with Harvard University, was studying the sources of various environmental pollutants. They made what was at the time a startling observation: Regardless of the community studied or its location, whether rural or urban, lightly or highly industrialized, and regardless of sex, age, smoking habits, and occupation, indoor air pollution was the major source of exposure to many air pollutants.1 This is perhaps not surprising: Most people spend 90 percent or more of their time indoors, and indoor sources emit many of the same pollutants as outdoor sources. Also, dilution with outdoor air happens slowly. In the years after this study indoor air pollution came to be ranked as a priority environmental health risk.
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