Indoor pollution sources that release gases or particles into the air are the primary cause of indoor air quality problems in homes. Inadequate ventilation can increase indoor pollutant levels by not bringing in enough outdoor air to dilute emissions from indoor sources and by not carrying indoor air pollutants out of the home. High temperature and humidity levels can also increase concentrations of some pollutants.
Additional information on indoor air quality may be found through the Indoor Air Quality frequent questions portal.
- "Relative Humidity" (Building Science Corporation, Westford, MA, 2002).
- "What is relative humidity and how does it affect how I feel outside?" (How Stuff Works)