http://www.niehs.nih.gov/health/topics/conditions/asthma/allergens.cfm
National Institute of Environmental Health Sciences, National Institutes of Health
This Web site was designed to help you survive the seasons by providing information on asthma, allergies, allergens, and asthma irritants such as cigarette smoke, cockroaches, dustmites, house dust, mold, pets, and pollen. Preventive strategies are provided to help you avoid exposure to these substances.