Hydrogen Sulfide

Standards

Hydrogen sulfide exposure addressed in specific OSHA standards for general industry, maritime, and construction. This section highlights OSHA standards and documents related to hydrogen sulfide.

OSHA Standards
General Industry (29 CFR 1910)
General Industry (29 CFR 1910)
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1910 Subpart G - Occupational Health and Environmental Control

1910.94, Ventilation.

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1910 Subpart H - Hazardous Materials

1910.119, Process safety management of highly hazardous chemicals.

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1910 Subpart I - Personal Protective Equipment

1910.134, Respiratory Protection.

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1910 Subpart J - General Environmental Controls

1910.146, Permit-required confined spaces.

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1910 Subpart Z - Toxic and Hazardous Substances

1910.1000, Air contaminants.

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1910.1200, Hazard Communication.

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1910.1450, Occupational exposure to hazardous chemicals in laboratories.

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Maritime (29 CFR 1915, 1917, 1918)
Maritime (29 CFR 1915, 1917, 1918)
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1915 Subpart B - Confined and Enclosed Spaces and Other Dangerous Atmospheres in Shipyard Employment

1915.12, Precautions and the order of testing before entering confined and enclosed spaces and other dangerous atmospheres.

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1915 Subpart Z - Toxic and Hazardous Substances

1915.1000, Air contaminants.

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1917 Subpart A - Scope and Definitions

1917.1, Scope and applicability.

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1917 Subpart D

1917.73, Terminal facilities handling menhaden and similar species of fish (see also §1917.2, definition of hazardous cargo, material, substance or atmosphere).

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1918 Subpart A

1918.1, Scope and application.

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1918 Subpart I

1918.94, Ventilation and atmospheric conditions (See also §1918.2, definitions of Hazardous cargo, materials, substance or atmosphere and Ro-Ro operations). See paragraph (f) for information specific to catch of menhaden and similar species of fish.

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Construction (29 CFR 1926)
Construction (29 CFR 1926)
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1926 Subpart D

1926.55, Gases, vapors, fumes, dusts, and mists.

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1926 Subpart S

1926.800, Underground Construction

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State Standards

There are 28 OSHA-approved State Plans, operating state-wide occupational safety and health programs. State Plans are required to have standards and enforcement programs that are at least as effective as OSHA's and may have different or more stringent requirements.

Additional Letters of Interpretation

Note: The letters in this list provide additional information that is not necessarily connected to a specific OSHA standard highlighted on this Safety and Health Topics page.

Worker Exposure Limits (Enforceable)
  • General Industry: 29 CFR 1910.1000 TABLE Z-2, Toxic and hazardous substances

    Exposures must not exceed 20 parts per million (ppm) (ceiling) with the following exception: if no other measurable exposure occurs during the 8-hour work shift, exposures may exceed 20 ppm, but not more than 50 ppm (peak), for a single time period up to 10 minutes.

  • Construction: 29 CFR 1926.55 Appendix A, Gases, vapors, fumes, dusts, and mists

    Sets exposure limit of 10 ppm (15 mg/m3) time-weighted average (TWA)

  • Shipyard: 29 CFR 1915.1000 Table Z, Air contaminants

    Sets exposure limit of 10 ppm (15 mg/m3) TWA

Other Exposure Limits for Hydrogen Sulfide

NIOSH Recommended Exposure Limit (REL): 10 ppm, 10-minute ceiling

Concentration considered immediately dangerous to life and health (IDLH): 100 ppm

ACGIH® recommends a threshold limit value (TLV®) of 1 ppm as an 8-hour time weighted average (TWA) and a short-term exposure limit (STEL) of 5 ppm.

29 CFR 1910.119 App A, List of highly hazardous chemicals, toxics and reactives (mandatory). Hydrogen sulfide is included in these lists of toxic and reactive highly hazardous chemicals and is considered to present a potential for a catastrophic event at or above 1500 pounds.