An International Programe on Chemical Safety Project
U.S. National Version
The U.S. National version of the ICSCs† has been modified by the National Institute for Occupational Safety and Health (NIOSH) to include the following:
Occupational Safety and Health Administration Permissible Exposure
Limits (OSHA PELs).
National Institute for Occupational Safety and Health Recommended
Expoure Limits (NIOSH RELs).