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Formaldehyde Awareness

For workers exposed to formaldehyde gas, solutions or formaldehyde-releasing materials: know the limits and your results, respect regulated areas, use the right protective equipment and emergency washing, handle leaks and spills, and use the medical surveillance you are entitled to.

Based on OSHA 29 CFR 1910.1048, Formaldehyde · about 6 min read

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The hazard and the limits

What is covered and why it matters

The standard covers exposure to formaldehyde from the gas, its solutions (such as formalin), and materials that release formaldehyde.

Hazards that must be addressed

CancerA hazard that must be addressed when classifying formaldehyde.
SensitizationSkin and respiratory sensitization.
IrritationEye, skin and respiratory tract irritation.
Toxicity and fireAcute toxicity effects and flammability.

Your employer must train you when you are first assigned, whenever a new formaldehyde exposure is introduced into your work area, and at least annually. The one exception: training is not required where the employer can show, using objective data, that employees are not exposed to formaldehyde at or above 0.1 ppm.

Reference: 29 CFR 1910.1048(a) · 29 CFR 1910.1048(m)(1)(ii) · 29 CFR 1910.1048(n)(2) · 29 CFR 1910.1048(n)(1)

The hazard and the limits

Three numbers and your results

TWA: 0.75 ppmPermissible limit averaged over 8 hours.
STEL: 2 ppmShort-term limit over any 15 minutes.
Action level: 0.5 ppm8-hour average that triggers more requirements, such as periodic monitoring and medical surveillance.

Your exposure is measured as what you would breathe without credit for any respirator you are wearing.

Your results

Reference: 29 CFR 1910.1048(c)(1) · 29 CFR 1910.1048(c)(2) · 29 CFR 1910.1048(b) "Action level" · 29 CFR 1910.1048(b) "Employee exposure" · 29 CFR 1910.1048(d)(2)(iii) · 29 CFR 1910.1048(d)(6) · 29 CFR 1910.1048(d)(7)(i) · 29 CFR 1910.1048(d)(3)(i) · 29 CFR 1910.1048(l)(1)(i)

Regulated areas, controls and respirators

The DANGER sign means authorized people only

Where airborne formaldehyde exceeds the TWA or the STEL, the employer must set up a regulated area and post all entrances and access ways with a sign that reads:

DANGER
FORMALDEHYDE
MAY CAUSE CANCER
CAUSES SKIN, EYE, AND RESPIRATORY IRRITATION
AUTHORIZED PERSONNEL ONLY

Only authorized persons who have been trained to recognize formaldehyde's hazards may enter.

Controls first, then respirators

The employer must use engineering and work practice controls to keep exposure at or below the TWA and the STEL. If feasible controls cannot get there, they are used as far as feasible and respirators are added. Respirators must be used during:

Chemical cartridges or canisters without an approved end-of-service-life indicator are replaced on the employer's schedule under 1910.134 or at the end of the workshift, whichever comes first.

Reference: 29 CFR 1910.1048(e)(1)(i) · 29 CFR 1910.1048(e)(2) · 29 CFR 1910.1048(f)(1) · 29 CFR 1910.1048(f)(2) · 29 CFR 1910.1048(g)(1)(i) · 29 CFR 1910.1048(g)(1)(ii) · 29 CFR 1910.1048(g)(1)(iii) · 29 CFR 1910.1048(g)(2)(ii) · 29 CFR 1910.1048(g)(1)

Skin, eyes and emergency washing

Protective clothing and equipment

When protective clothing and equipment are provided, your employer provides them at no cost to you and must make sure you wear them.

Reference: 29 CFR 1910.1048(h) · 29 CFR 1910.1048(h)(1)(i) · 29 CFR 1910.1048(h)(1)(iii) · 29 CFR 1910.1048(h)(1)(iv) · 29 CFR 1910.1048(h)(2)(i) · 29 CFR 1910.1048(h)(2)(iv)

Skin, eyes and emergency washing

Drench showers and eyewash

Skin splash: 1% or moreWhere skin may be splashed with solutions of 1 percent or greater, conveniently located quick drench showers must be provided, and you must use them immediately.
Eye splash: 0.1% or moreWhere eyes may be splashed with solutions of 0.1 percent or greater, eyewash must be provided within the immediate work area.

If you change from work clothing into protective clothing to prevent skin contact, the employer must provide change rooms.

Your part (good practice): know where the nearest drench shower and eyewash are before you start, and keep the path to them clear.

Reference: 29 CFR 1910.1048(i)(1) · 29 CFR 1910.1048(i)(2) · 29 CFR 1910.1048(i)(3)

Leaks, spills and emergencies

Find leaks, clean spills safely

Emergencies

An emergency is an occurrence such as equipment failure, a ruptured container or failed control equipment that results in an uncontrolled release of a significant amount of formaldehyde. Where an emergency involving formaldehyde is possible, your employer must adopt procedures to minimize injury and loss of life, and your training must review your specific duties in an emergency.

Your part (good practice): if you are not trained and equipped for the cleanup, keep people away and report the spill instead of cleaning it yourself.

Reference: 29 CFR 1910.1048(j) · 29 CFR 1910.1048(j)(3) · 29 CFR 1910.1048(j)(4) · 29 CFR 1910.1048(k) · 29 CFR 1910.1048(b) "Emergency" · 29 CFR 1910.1048(n)(3)(vii)

Symptoms and medical surveillance

Report symptoms; know your medical rights

Your training must tell you to immediately report to your employer any adverse signs or symptoms you suspect come from formaldehyde exposure.

Who gets medical surveillance

How it works

Reference: 29 CFR 1910.1048(n)(3)(ii)(B) · 29 CFR 1910.1048(l)(1)(i) · 29 CFR 1910.1048(l)(1)(ii) · 29 CFR 1910.1048(l)(2) · 29 CFR 1910.1048(l)(3) · 29 CFR 1910.1048(l)(7)(iii) · 29 CFR 1910.1048(l)(8)(ii) · 29 CFR 1910.1048(l)(3)(i)

Need proof of training? The full course (25 min) adds practice questions, a job scenario, the final quiz and a certificate your employer can verify.

Take the course

Sources

Fact-checked against the regulation text on October 09, 2026. This certificate records completion of awareness training based on OSHA 29 CFR 1910.1048. It is not an OSHA card or license, and it does not by itself meet the training requirements of 29 CFR 1910.1048(n). Your employer must still assure that each employee assigned to a workplace where there is exposure to formaldehyde participates in a training program, at the time of initial assignment, whenever a new exposure to formaldehyde is introduced into the work area, and at least annually, conducted in a manner the employee is able to understand and covering the items in 1910.1048(n)(3), including a description of operations in the work area where formaldehyde is present and the safe work practices appropriate for limiting exposure in each job, instructions for handling spills, emergencies and clean-up, and a review of emergency procedures including the specific duties or assignments of each employee. The one exception: the employer is not required to provide training where it can show, using objective data, that employees are not exposed to formaldehyde at or above 0.1 ppm.

This guide explains the rule in plain words. Always read the regulation itself and your employer's site-specific procedures.