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 Causes of indoor air pollution 

• High Humidity
• Tobacco products
• Building materials and furnishings
• Cleaning, personal care, and hobby products
• Central heating and cooling systems
• Excess moisture
• Radon, a radioactive gas that can enter through cracks in walls and floors
• Nitrogen dioxide, a precursor to ozone and particulate matter

Health effects

• Poor indoor air quality can cause headaches, fatigue, trouble c
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