Exposure Limits

The Occupational Safety and Health Administration (OSHA) has established 20 ppm by volume as an acceptable ceiling concentration (ACC) and 50 ppm by volume as an ac­ceptable maximum peak above the ACC for an 8-hour shift for hydrogen sulfide (refer to 29 Code of Federal Regula­tions Part 1910.1000, Subpart Z, Table Z-2). The American Conference of Governmental Industrial Hygienists (ACGIH) recommends a Threshold Limit Value (TLV)®"j of 10 ppm (eight-hour TWA) and a short term exposure limit (STEL) of 15 ppm averaged over fifteen minutes. Exposure at the STEL should not be repeated more than four times per day with at least sixty minutes between successive exposures in this range. For Outer Continental Shelf (OCS) oil and gas pro­ducing operations, exposure levels exceeding 20 ppm instan­taneous exposure require use of personal protective breathing equipment pursuant to U. S. Department of Interior, Minerals Management Service Final Rule, 30 Code of Federal Regu­lations Part 250.67, as published at 53 Federal Register

f'^TLV" is a trademaiked term of the American Conference of Governmen­tal Industrial Hygienists (ACGIH). Refer to Threshold Limit Values and Bi­ological Exposure Indices and companion documents available from ACGIH, 1330 Kemper Meadow Drive, Cincinnati, OH 45240 (check latest edition).

10596-10777, April 1, 1988«>. The NIOSH Recommended Standard for Occupational Exposure to Hydrogen Sulfide should be consulted for additional detailed information. Re-' fer to Table A-2 for additional information on exposure val­ues. CHECK WITH THE EMPLOYER CONCERNING EXPOSURE LIMITS FOR PARTICULAR CIRCUM­STANCES.