California Indoor Air Quality Program
From the California Department of Health Services. Lots of info. Great factsheets: mold, classrooms and air quality, asbestos, hazards of ozone-generating air cleaning devices, and selecting an indoor air quality consultant. http://www.cal-iaq.org/
The Indoor Air Quality Association
Nonprofit organization conducting education and research. Offers professional training, testing, and credentials in air quality and mold remediation fields. Includes organization information and links to related sites. http://www.iaqa.org/