What are common indoor air pollutants?

Understanding and controlling some of the common pollutants found in homes, schools, and offices may help improve your indoor air and reduce your family’s risk of health concerns related to indoor air quality (IAQ).
Radon is a radioactive gas that is formed in the soil. It can enter indoors through cracks and openings in floors and walls that are in contact with the ground.
- Radon is the leading cause of lung cancer among nonsmokers, and the second leading cause of lung cancer overall.
Secondhand smoke comes from burning tobacco products. It can cause cancer and serious respiratory illnesses.