# alpha-Methyl styrene — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side

For alpha-Methyl styrene, cas no. is 98-83-9; pel (ppm) is (C)100; pel (mg/m³) is (C)480, verified against its source on 2026-08-05.

- **Substance:** alpha-Methyl styrene
- **CAS No.:** 98-83-9
- **PEL (ppm):** (C)100
- **PEL (mg/m³):** (C)480

## What the source says

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

## Source

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

Last verified: 2026-08-05. Review by: 2027-08-05.
Part of [US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side](https://referencesource.org/workplace-exposure-limits/).