What Can Cause IAQ Issues?

Radon naturally occurs through many places in the U.S.

Radon naturally occurs through many places in the U.S.


Materials that can release gases or particles into the air are the primary cause of indoor air quality (IAQ) issues. Inadequate ventilation or poor air flow can increase indoor pollutant levels by not bringing enough outside air inside to dilute emissions. High temperature and humidity levels can also increase concentrations of some pollutants.

Sources of Pollutants

Some of the sources of indoor air pollution can include:

  • Fuel-burning combustion appliances such as stoves and furnaces (be sure to read more about combustion and carbon monoxide)
  • Tobacco products
  • Building materials and furnishings as diverse as newly installed flooring, deteriorated asbestos-containing insulation, and cabinetry or furniture made from certain wood products
  • Household cleaning and personal care products
  • Humidification devices and central heating and cooling systems
  • Excess moisture
  • Outdoor sources such as radon, pesticides, and outdoor air pollution

Performing a Stove CO Test

The importance (and effect on your health) depends on how much of a given pollutant is emitted 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 (CO) than one that is properly adjusted. Be sure to find a certified HVAC professional who can perform a thorough carbon monoxide analysis to protect your family.

Some sources, such as building materials, furnishings and products like air fresheners, can release pollutants more or less continuously. Other sources, related to activities like smoking, cleaning, redecorating, or doing hobbies release pollutants intermittently. Unvented or malfunctioning appliances or improperly used products can release higher and sometimes dangerous levels of pollutants indoors.

Pollutant concentrations can remain in the air for long periods after some activities.