---
type: threshold
id: hydroquinone-1-4-benezendiol
asset: workplace-exposure-limits
title: "Hydroquinone; 1,4-benezendiol — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.dir.ca.gov/title8/5155.html
source_quote: "123319 | | Hydroquinone; 1,4-benezendiol | -- | 2"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Hydroquinone; 1,4-benezendiol"
pel_mgm3: "2"
verified: true
---
**Substance:** Hydroquinone; 1,4-benezendiol

**PEL (mg/m³):** 2

> 123319 | | Hydroquinone; 1,4-benezendiol | -- | 2

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