PEL and REL are acronyms used by the safety industry to define Permissible Exposure Limits (OSHA term) and Recommended Exposure Limits (NIOSH term).
In 1974, NIOSH joined OSHA in developing a series of occupational health standards for substances with existing PELs. OSHA sets enforceable permissible exposure limits (PELs) to protect workers against the health effects of exposure to hazardous substances. PELs are regulatory limits on the amount or concentration of a substance in the air. They may also contain a skin designation. OSHA PELs are based on an 8-hour time weighted average (TWA) exposure. Together NIOSH and OSHA set limits for 380 hazardous chemicals.
OSHA currently has about 500 permissible exposure limits (29 CFR part1910.1000), while NIOSH has about 700 RELs. NIOSH is able to evaluate them while OSHA PEL limits has not be updated since late 1960’s.
Acting under the authority of the Occupational Safety and Health Act of 1970 (29 USC Chapter 15) and the Federal Mine Safety and Health Act of 1977 (30 USC Chapter 22), NIOSH develops and periodically revises recommended exposure limits (RELs) for hazardous substances or conditions in the workplace. NIOSH also recommends appropriate preventive measures to reduce or eliminate the adverse health and safety effects of these hazards.
The NIOSH Web site features many different types of databases and information collections. The most popular databases include the International Chemical Safety Cards, NIOSH Pocket Guide to Chemical Hazards, and NIOSHTIC-2.
Chemical Databases:
· Immediately Dangerous to Life and Health (IDLH)
Provides the immediately dangerous to life or health air concentration values (IDLHs) for substances and the criteria and information sources that have been used to determine these values.
· International Chemical Safety Cards (WHO/IPCS/ILO)
ICSC cards summarize essential health and safety information on chemicals for their use at the “shop floor” level by workers and employers in factories, agriculture, construction and other work places.
· Manual of Analytical Methods (NMAM)
NMAM is a collection of methods for sampling and analysis of contaminants in workplace air, and in the blood and urine of workers who are occupationally exposed.
· NIOSH Pocket Guide to Chemical Hazards (NPG)
The NPG is intended as a source of general industrial hygiene information on several hundred chemicals/classes for workers, employers, and occupational health professionals.
· The Emergency Response Safety and Health Database (ERSH-DB)
Developed by NIOSH for the emergency response community, The ERSH-DB contains accurate and concise information on high-priority chemical, biological and radiological agents that could be encountered by personnel responding to a terrorist event.
·Occupational Safety and Health Guidelines for Chemical Hazards
Summarizes information on permissible exposure limits, chemical and physical properties, and health hazards. It provides recommendations for medical surveillance, respiratory protection, and personal protection and sanitation practices for specific chemicals that have Federal occupational safety and health regulations.
· OSHA 1988 Permissible Exposure Limits (PELs)
PELs are OSHA comments from the January 19, 1989 Final Rule on Air Contaminants Project extracted from 54FR2332 et. seq. This rule was remanded by the U.S. Circuit Court of Appeals and the limits are not currently in force.
·Specific Medical Test Published in the Literature for OSHA Regulated Substances (MEDTEST)
The MEDTEST database lists the specific medical tests published in the literature for OSHA regulated substances. Updates of OSHA mandated tests (July 1, 2000) and NIOSH/OSHA recommendations are included.