---
type: threshold
id: hydrogen-cyanide
asset: workplace-exposure-limits
title: "Hydrogen cyanide — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
source_quote: "Hydrogen cyanide | 74-90-8 | 10 | 11 | X |"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Hydrogen cyanide"
cas_number: "74-90-8"
pel_ppm: "10"
pel_mgm3: "11"
verified: true
---
**Substance:** Hydrogen cyanide

**CAS No.:** 74-90-8

**PEL (ppm):** 10

**PEL (mg/m³):** 11

> Hydrogen cyanide | 74-90-8 | 10 | 11 | X |

Source: <https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1>