---
type: threshold
id: chloroform-trichloromethane
asset: workplace-exposure-limits
title: "Chloroform (Trichloromethane) — 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: "Chloroform (Trichloromethane) | 67-66-3 | (C)50 | (C)240 | - |"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Chloroform (Trichloromethane)"
cas_number: "67-66-3"
pel_ppm: "(C)50"
pel_mgm3: "(C)240"
verified: true
---
**Substance:** Chloroform (Trichloromethane)

**CAS No.:** 67-66-3

**PEL (ppm):** (C)50

**PEL (mg/m³):** (C)240

> Chloroform (Trichloromethane) | 67-66-3 | (C)50 | (C)240 | - |

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