American Academy of Allergy, Asthma and Immunology
http://www.aaaai.org

American Lung Association
http://www.lungusa.org
http://www.healthhouse.org

Asthma and Allergy Foundation of America
http://www.aafa.org

Asthma and Indoor Environment, US Environmental Protection Agency
http://www.epa.gov/asthma

Children’s Health Environmental Coalition
http://www.checnet.org/healthehouse/home/index.asp

Indoor Air Quality, US Environmental Protection Agency
http://www.epa.gov/iaq

Medline Plus
http://www.nlm.nih.gov/medlineplus/asthma.html