National Air Filtration Association (NAFA)
The leading organization in air filtration in the world. Excellent source of information about air filters. Recognized Certification for Air Filter Specialists (CAFS)
American Academy of Asthma, Allergy and Immunology
Organization of professionals from research institutes, academia and physicians promoting research and education in allergy, asthma and immunology. Great site for information about allergies and asthma.
American College of Asthma, Allergy and Immunology
Primarily physicians in the fields of allergy, asthma and immunology. Excellent articles available on this site.
Environmental Protection Agency (EPA)
A major resource for information on Indoor Air Quality. See especially their papers on air cleaning devices.
American Lung Association (ALA)
Contains a lengthy and well researched article on air filtration and air cleaning devices. Soon to be updated.
U. S. Green Building Council
An organization dedicated to the development of environmentally sound building practices. The developer of the LEED (Leadership in Energy and Environmental Design) program.
National Jewish Medical and Research Center
One of the leading research and clinical allergy and asthma centers in the United States. Good site with many helpful articles. Worth a visit.