1) EPA: Environmental Protection Agency (http://www.epa.gov/epahome/aboutepa.htm)
2) WHO: World Health Organization (http://www.who.int/about/en)
3) NIH: National Institutes of Health (http://www.nih.gov/about/index.html)
4) CDC: Center for Disease Control and Prevention (http://www.cdc.gov)
5) http://www.kwdr.net/2/public-health/environmental%20health
6) http://las.perkinelmer.com/Catalog/default.htm?CategoryID=Environmental&utm_source=blitz&utm_medium=ppc&utm_campaign=environment
7) http://www.dbmain.biz/4/air-pollution/pollution%20air
8) NIOSH: The National Institute for Occupational Safety and Health (http://www.cdc.gov/niosh)
9) http://www.diva-portal.org/smash/search.jsf
10) www.ansi.org
11) http://www.ifeh.org
12) http://www.awwa.org/