SOURCES OF INDOOR AIR POLLUTION For most people, the greatest exposure to air pollution comes from being indoors. There are many sources of air pollution in a home or other building, as these structures tend to trap pollutants, keeping concentrations high. One can reduce exposure by avoiding or limiting the use of carpets, upholstered items, and furniture made with toxic glue and formaldehyde. Safer cleaners and low-VOC paints are readily available. Simple behaviours like taking off your shoes before entering the house and using a vacuum equipped with a HEPA filter will also help—especially important if you have indoor pets. Good ventilation and properly working heating and air conditioning units help keep indoor air pollutants at bay.