Most people spend more than 75 percent of their time inside, so their exposure to many common air pollutants is determined by the level of these substances found inside rather than outside. Air quality in a building will vary widely from one building to another depending on a variety of factors, including the production of chemicals and gases emitted from heating devices, internal fittings, and structural components. Another important factor in determining the level pf air pollution inside is the rate of removal of these substances, which depends on how well your home is ventilated.
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