# Methylenedianiline — OSHA medical surveillance trigger thresholds by substance

For Methylenedianiline, cfr section is 1910.1050; action level is 5 ppb as an eight (8)-hour time-weighted average; pel is ten parts per billion (10 ppb) as an 8-hour time-weighted average; STEL of 100 ppb; surveillance trigger is Employees exposed at or above the action level for 30 or more days per year; employees who are subject to dermal exposure to MDA for 15 or more days per year; employees who have been exposed in an emergency situation; exam frequency is within 150 days of the effective date or before the time of initial assignment; at least annually following the initial examination, recorded from its source on 2026-08-12.

- **Substance:** Methylenedianiline _(verified: appears in the quote below)_
- **CFR section:** 1910.1050 _(verified: appears in the quote below)_
- **Action level:** 5 ppb as an eight (8)-hour time-weighted average
- **PEL:** ten parts per billion (10 ppb) as an 8-hour time-weighted average; STEL of 100 ppb
- **Surveillance trigger:** Employees exposed at or above the action level for 30 or more days per year; employees who are subject to dermal exposure to MDA for 15 or more days per year; employees who have been exposed in an emergency situation
- **Exam frequency:** within 150 days of the effective date or before the time of initial assignment; at least annually following the initial examination
- **Record retention:** exposure records: at least 30 years; medical records: at least the duration of employment plus 30 years

## What the source says

> 1910.1050 Methylenedianiline." /> 29 CFR §

## Source

- https://www.law.cornell.edu/cfr/text/29/1910.1050

Last verified: 2026-08-12. Review by: 2027-02-08.
Part of [OSHA medical surveillance trigger thresholds by substance](https://referencesource.org/osha-medical-surveillance-triggers/).