# Styrene (monomer); phenylethylene — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side

For Styrene (monomer); phenylethylene, pel (ppm) is 50; pel (mg/m³) is 215; ceiling is 500 ppm; stel (ppm) is 100; stel (mg/m³) is 425, verified against its source on 2026-08-05.

- **Substance:** Styrene (monomer); phenylethylene
- **PEL (ppm):** 50
- **PEL (mg/m³):** 215
- **Ceiling:** 500 ppm
- **STEL (ppm):** 100
- **STEL (mg/m³):** 425

## What the source says

> 100425 | S | Styrene (monomer); phenylethylene | 50 | 215 | 500 ppm | 100 | 425

## Source

- https://www.dir.ca.gov/title8/5155.html

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/).