- Building materials
- Home furnishings such as furniture made of compressed wood, carpets and drapes
- Combustion sources such as oil, gas, kerosene or wood
- Cleaning products and personal care items
- Hobby products such as paints, varnishes, etc.
- Heating and cooling systems and humidifiers
- Tobacco smoke
- Outside sources that come into the house such as radon, pesticides and outdoor air pollution
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