Methylenedianiline
For Methylenedianiline, cfr section is 1910.1050; action level is 5 ppb as an eight (8)-hour time-weighted average; pel is an airborne concentration of MDA in excess of ten parts per billion (10 ppb) as an 8-hour time-weighted average; surveillance trigger is Employees exposed at or above the action level for 30 or more days per year; exam frequency is a medical examination at least annually following the initial examination, verified against its source on 2026-09-17.
- Substance
- Methylenedianiline
- CFR section
- 1910.1050
- Action level
- 5 ppb as an eight (8)-hour time-weighted average verified
- PEL
- an airborne concentration of MDA in excess of ten parts per billion (10 ppb) as an 8-hour time-weighted average verified
- Surveillance trigger
- Employees exposed at or above the action level for 30 or more days per year verified
- Exam frequency
- a medical examination at least annually following the initial examination verified
- Record retention
- The employer shall maintain this record for at least the duration of employment plus 30 years verified
What the source says
Medical surveillance—(1) General. (i) The employer shall make available a medical surveillance program for employees exposed to MDA: (A) Employees exposed at or above the action level for 30 or more days per year; (B) Employees who are subject to dermal exposure to MDA for 15 or more days per year; (C) Employees who have been exposed in an emergency situation;
— law.cornell.edu, retrieved 2026-08-12
Where each value comes from
This source states these in separate places, so each value is shown with the passage that states it.
Action level
(b) Definitions. For the purpose of this section, the following definitions shall apply: Action level means a concentration of airborne MDA of 5 ppb as an eight (8)-hour time-weighted average.
PEL
Regulated areas means areas where airborne concentrations of MDA exceed or can reasonably be expected to exceed, the permissible exposure limits , or where dermal exposure to MDA can occur. STEL means short term exposure limit as determined by any 15 minute sample period. (c) Permissible exposure limits (PEL). The employer shall assure that no employee is exposed to an airborne concentration of MDA in excess of ten parts per billion (10 ppb) as an 8-hour time-weighted average or a STEL of 100 ppb.
Surveillance trigger
(6) Waste, scrap, debris, bags, containers, equipment, and clothing contaminated with MDA shall be collected and disposed of in a manner to prevent the re-entry of MDA into the workplace. (m) Medical surveillance—(1) General. (i) The employer shall make available a medical surveillance program for employees exposed to MDA: (A) Employees exposed at or above the action level for 30 or more days per year;
Exam frequency
(ii) No initial medical examination is required if adequate records show that the employee has been examined in accordance with the requirements of this section within the previous six months prior to the effective date of this standard or prior to the date of initial assignment. (3) Periodic examinations . (i) The employer shall provide each employee covered by this section with a medical examination at least annually following the initial examination.
Record retention
(B) A copy of the information provided to the physician as required by any paragraphs in the regulatory text; (C) A description of the laboratory procedures and a copy of any standards or guidelines used to interpret the test results or references to the information; (D) A copy of the employee's medical and work history related to exposure to MDA; and (iv) The employer shall maintain this record for at least the duration of employment plus 30 years, in accordance with 29 CFR 1910.1020 .
— all from law.cornell.edu, retrieved 2026-08-12
Source
- law.cornell.eduhttps://www.law.cornell.edu/cfr/text/29/1910.1050