---
type: threshold
id: naphthalene
asset: workplace-exposure-limits
title: "Naphthalene — 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: "Naphthalene | 91-20-3 | 10 | 50 | - |"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Naphthalene"
cas_number: "91-20-3"
pel_ppm: "10"
pel_mgm3: "50"
verified: true
---
**Substance:** Naphthalene

**CAS No.:** 91-20-3

**PEL (ppm):** 10

**PEL (mg/m³):** 50

> Naphthalene | 91-20-3 | 10 | 50 | - |

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