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Poor indoor air can arise from many sources. At least some of the following contaminants can be found in almost any home:
• Moisture and biological pollutants such as molds, mildew, dust mites, animal dander and cockroaches from high humidity levels, inadequate ventilation, and poorly maintained humidifiers and air conditioners.
• Combustion products, including carbon monoxide, from unvented fossil fuel space heaters, unvented gas stoves and ovens, and backdrafting from furnaces and water heaters.
• Formaldehyde from durable press draperies and other textiles, particle board products such as cabinets and furniture framing, and adhesives.
• Radon, a radioactive gas from soil and rock beneath and around the home's foundation, groundwater wells and some building materials.
• Household products and furnishings such as paints, solvents, air fresheners, hobby supplies, dry-cleaned clothing, aerosol sprays, adhesives, and fabric additives used in carpeting and furniture which can release volatile organic compounds (VOC).
• Asbestos found in most homes more than 20 years old. Sources include deteriorating, damaged or disturbed pipe insulation, fire retardant, acoustical material and floor tiles.
• Lead from lead-based paint dust created when removing paint by sanding, scraping or burning.
• Particulates from dust and pollen, fireplaces, wood stoves, kerosene heaters and unvented gas space heaters.
Tobacco smoke, which produces particulates, combustion products and formaldehyde.
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