# N-Methylpyrrolidone (NMP) — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side

For N-Methylpyrrolidone (NMP), pel (ppm) is 1; pel (mg/m³) is 4, verified against its source on 2026-08-05.

- **Substance:** N-Methylpyrrolidone (NMP)
- **PEL (ppm):** 1
- **PEL (mg/m³):** 4

## What the source says

> 872504 | S | N-Methylpyrrolidone (NMP) | 1 | 4

## 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/).