H2S Exposure Limits
Definition - What does H2S Exposure Limits mean?
Safeopedia explains H2S Exposure Limits
OSHA Permissible Exposure Limits (PEL) for H2S are listed below for conditions stated:
General industry - up to 20 ppm.
Exceptions - may exceed 20 ppm if no other exposures during 8 hour work shift, but not more than 50 ppm for a single time exposure for 10 minutes.
Construction industry - up to 10 ppm
Maritime industry - 10 ppm
American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV) - 1 ppm and for Short Term Exposure Limit (STEL) 5 ppm National Institute for Occupational Safety and Health (NIOSH)
Recommended Exposure Limit (REL) - 10 ppm (10 Minutes)
H2S exposure can be monitored by the following instruments:
Personal H2S monitor - worn by individuals, provides continuous monitoring and audible warning.
Continuous fixed H2S monitoring systems - fixed at workplaces and used for continuous H2S concentration monitoring. It provides audible alarms.