---
type: threshold
id: alpha-methyl-styrene
asset: workplace-exposure-limits
title: "alpha-Methyl styrene — 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: "alpha-Methyl styrene | 98-83-9 | (C)100 | (C)480 | - |"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "alpha-Methyl styrene"
cas_number: "98-83-9"
pel_ppm: "(C)100"
pel_mgm3: "(C)480"
verified: true
---
**Substance:** alpha-Methyl styrene

**CAS No.:** 98-83-9

**PEL (ppm):** (C)100

**PEL (mg/m³):** (C)480

> alpha-Methyl styrene | 98-83-9 | (C)100 | (C)480 | - |

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