The Environmental Health Investigations Branch of the California Department of Public Health has created an online guide for those who want to study the link between environmental exposure to chemicals and the health effects experienced by a community by conducting a health study. The information gives the basics about health studies, discusses when a health study is appropriate, and offers examples and alternatives to health studies. Check out this guide, which is linked from our Toxicology/Occupational Health Resources page at:
http://www.lib.berkeley.edu/PUBL/tox.html