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as outdoors, and sometimes polluted air from outdoors comes into a building and pollute that air. There are also pollutants that tend to occur indoors, such as happens when someone is smoking (Turiel, 1985, p. 9).

There are three main sources of manmade pollution in the outdoor air: fuel combustion in stationary sources, such as power plants; fuel combustion in mobile sources, such as automobiles; and industrial processes,

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