(HealthDay News) -- The best place to ensure clean air is at home. And the first step is to make sure that you aren't making the air quality worse.

The Environmental Protection Agency says these factors can contribute to indoor air pollution:

• Poor ventilation
• High humidity and high temperatures
• Combustion sources, such as tobacco, kerosene, oil, wood, gas and coal
• Insulation that contains asbestos
• Some types of furniture made from compressed wood
• Damp or wet carpeting
• Fumes from household cleaning products
• Outdoor sources, such as pesticides, radon or air pollution.

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