---
type: threshold
id: 1-4-dichloro-2-butene
asset: workplace-exposure-limits
title: "1,4-Dichloro-2-butene — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.dir.ca.gov/title8/5155.html
source_quote: "764410 | S | 1,4-Dichloro-2-butene | 0.005 | 0.025"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "1,4-Dichloro-2-butene"
pel_ppm: "0.005"
pel_mgm3: "0.025"
verified: true
---
**Substance:** 1,4-Dichloro-2-butene

**PEL (ppm):** 0.005

**PEL (mg/m³):** 0.025

> 764410 | S | 1,4-Dichloro-2-butene | 0.005 | 0.025

Source: <https://www.dir.ca.gov/title8/5155.html>