EPA's Indoor Air Quality - http://www.epa.gov/iaq/
Information for homeowner, schools, commercial buildings and environmental professional on indoor air quality. Extensive links to sites.

The Information provided here comes primarily from EPA's "The Inside Story: A Guide to Indoor Air Quality".  The information provided here is based on current scientific and technical understanding of the issues presented and is reflective of the jurisdictional boundaries established by the statutes governing the co-authoring agencies. Following the advice given will not necessarily provide complete protection in all situations or against all health hazards that may be caused by indoor air pollution.

What Causes Indoor Air Problems?

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.

Pollutant Sources

There are many sources of indoor air pollution in any home. These include combustion sources such as oil, gas, kerosene, coal, wood, and tobacco products; building materials and furnishings as diverse as deteriorated, asbestos-containing insulation, wet or damp carpet, and cabinetry or furniture made of certain pressed wood products; products for household cleaning and maintenance, personal care, or hobbies; central heating and cooling systems and humidification devices; and outdoor sources such as radon, pesticides, and outdoor air pollution.

Why does Indoor Air Quality matter? The air quality of our indoor environments effects our health and often contributes to structural degradation and building failures within our homes.... http://www.healthhouse.org/IAQ/index.asp

Consider the facts about Home air quality:

• According to the American Lung Association of Minnesota, elements within our home and workplaces have been increasingly recognized as threats to our respiratory health. The most common pollutants are radon, combustion products, biologicals (molds, pet dander, pollen), volatile organic compounds, lead dust and asbestos.
• The Environmental Protection Agency lists poor indoor air quality as the fourth largest environmental threat to our country.
• There are an estimated 42.6 million Americans living with hay fever and/or asthma. Learning how to control a home’s environment to reduce allergen levels is important for managing allergies and asthma. Individuals who suffer from asthma, or have other respiratory illness may potentially be at a greater risk for health complications associated with poor air quality in their homes.

Air Consultants - Office of Small Business Assistance Air Consultants Listing

Air Projects and Programs - US Environmental Protection Agency

Glossary of Environmental Terms: EPA's "Terms Of Environment" defines
in non-technical language the more commonly used environmental terms.

NEET - New Environmental Technology. A Clean Air Technology database

Regenerating Your Environment is Healthy Choice you can control.