Occupational Safety and Health Administration (OSHA)
Permissible exposure limits (PELs) and a guide to OSHA standards for screening and surveillance
	200 Constitution Ave. NW
	Washington, DC 20210
	Telephone: 202-693-2300
	Web site: http://www.osha.gov
American Conference of Government Industrial Hygienists
Threshold limit values (TLVs) and biological exposure indices (BEIs)
	1330 Kemper Meadow Dr.
	Suite 600
	Cincinnati, OH 45240
	Telephone: 513-742-2020
	Web site: http://www.acgih.org
National Institute for Occupational Safety and Health (NIOSH)
Recommended exposure limits (RELs)
	1600 Clifton Rd. NE
	Atlanta, GA 30333
	Telephone: 800-356-4674
	Web site: http://www.cdc.gov/niosh/homepage.html