Aetna Intelihealth
Aetna: Inteli Health: Types of Allergies
Insightful article that categorizes and describes the various types of allergies. Also gives information on treatment of symptoms.
WebMD
Web Md: Airborne Allergens
This site from WebMD Health provides an article entitled, "Something in the Air: Airborne Allergens". Includes detailed information on why some people are allergic to certain substances, while others are not. Symptoms of airborne...
Other
American Academy of Allergy, Asthma and Immunology
This resource describes an organization that is involved in studies and treatments of allergies. Research and education are also important parts of this organization.