While most of us have heard of outdoor air pollution, the air inside a home or building can be much more polluted than the air outdoors. Indoor air pollution can be a real concern because we spend as much as 90 percent of our time indoors, and 60 percent of our time at home. Possible sources of poor indoor air quality include: • Tobacco smoke • Household cleaning products and other chemicals • Too much moisture and mold • Dust and dust mites • Heating systems (furnaces, wood stoves, water heaters, and fireplaces) • Poor ventilation • Pests (rodents and cockroaches) • Radon and carbon monoxide
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