(HealthDay News) -- Most people are indoors about 90 percent of the time, says the womenshealth.gov website, noting the significance of indoor air pollution.

The site mentions these common sources of bad indoor air:

  • Residues from wood, coal, oil or gas burned inside the home.
  • Tobacco smoke.
  • Materials used in building a home, including asbestos insulation and pressed wood.
  • Radon gas buildup.
  • Pest control products, painting, or cleaning chemicals.
  • Nail polish remover, hair spray or other personal care products.
  • Bacteria, pet dander, molds, mildew or other biological pollutants.