Some common sources of indoor air pollution include:
Combustion sources (e.g., gas stoves, fireplaces, candles)
Building materials and furnishings (e.g., asbestos, formaldehyde)
Household products (e.g., cleaning products, air fresheners)
Biological contaminants (e.g., mould, pet dander, pollen)
Outdoor air pollutants infiltrating indoors