Learn About Pollutants

Indoor pollution sources that release gases or particles into the air are the primary cause of indoor air quality problems. Usually, the most effective way to improve indoor air quality is to eliminate individual sources of pollution or to reduce their emissions. Some sources, like those that contain asbestos, can be sealed or enclosed; others, like gas stoves, can be adjusted to decrease the amount of emissions.

The relative importance of any single source depends on how much of a given pollutant it emits and how hazardous those emissions are. In some cases, factors such as how old the source is and whether it is properly maintained are significant. For example, an improperly adjusted gas stove can emit significantly more carbon monoxide than one that is properly adjusted. Unvented or malfunctioning appliances or improperly used products can release higher and sometimes dangerous levels of pollutants indoors.

Some sources, such as building materials, furnishings and products like air fresheners, can release pollutants continuously. Other sources, related to activities like smoking, cleaning, redecorating or doing hobbies release pollutants intermittently.

Each tile below provides further information on specific sources of indoor air pollution in your home.