• According to the Environmental Protection Agency of USA,the 4 most dangerous indoor air pollutants are:
  • Tobacco smoke
  • Formaldehyde
  • Radioactive radon-222 gas
  • Very small fine & ultrafine particles

—Other Important Indoor Air pollutants Nitrogen dioxide Carbon monoxide Volatile Organic Compounds (VOCs) House dust mites (& other allergens from pets) Chlorinated organic compounds (ex. pesticides) Asbestos & man-made mineral fibres

—Sources Building materials Furnishings & fabrics Glues Cleaning products Combustion appliances (cooking & heating) Open fires Smoking Living organisms Outdoor air

Tobacco Smoke

• The most dangerous indoor pollutants tobacco smoke
  • Secondhand smoke from cigarettes is especially dangerous.
  • Passive smoking, as generally known poses severe threat to lungs and in severe cases leads to cancer.
  • Smoke is harmful as it:
    • Contains over 4000 dangerous chemicals responsible for causing eye, nose, and throat irritation.