---
type: threshold
id: methyl-isocyanate
asset: workplace-exposure-limits
title: "Methyl isocyanate — 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: "Methyl isocyanate | 624-83-9 | 0.02 | 0.05 | X |"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Methyl isocyanate"
cas_number: "624-83-9"
pel_ppm: "0.02"
pel_mgm3: "0.05"
verified: true
---
**Substance:** Methyl isocyanate

**CAS No.:** 624-83-9

**PEL (ppm):** 0.02

**PEL (mg/m³):** 0.05

> Methyl isocyanate | 624-83-9 | 0.02 | 0.05 | X |

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