OSHA 29 CFR 1910.134: Respiratory Protection Program

OSHA 29 CFR 1910.134 is the federal respiratory protection standard. It reaches every employer whose employees use respirators, whether the employer requires them or the employee chooses to wear one voluntarily. The standard covers everything from disposable N95 filtering facepieces to supplied-air systems used in immediately dangerous to life or health (IDLH) environments.

The standard requires employers to establish and maintain a respiratory protection program whenever respirators are necessary to protect employee health or whenever respirators are required by the employer. The program must be worksite-specific and written. OSHA does not accept a generic template — the plan must describe the actual hazards, respirators, and procedures at your facility or job site.

1910.134 sits in Part 1910, the general industry rules, and it reaches construction work through a second regulation. 29 CFR 1926.103 states that the respiratory protection requirements applicable to construction work are identical to those set forth at 29 CFR 1910.134. That is why a contractor cited for a respirator violation on a job site is answering to the same paragraph numbers a plant manager is. In practice the standard turns up in manufacturing, construction, healthcare, laboratories, welding shops, painting operations, pharmaceutical production, and foundries, and anywhere else airborne contaminants or oxygen-deficient atmospheres exist.

The standard is long, but the obligations it creates are finite. This table maps each one to the paragraph it comes from, so you can cite the source when you build the program or answer an inspector. The sections below work through the ones that cause the most trouble.

Not every workplace needs a full respiratory protection program. The decision depends on whether respirator use is required by the employer (or by OSHA) or purely voluntary by the employee.

Decision tree — does your workplace need a full respiratory protection program?

A full written program is required when any of these conditions exist:

• Employee exposure to airborne contaminants exceeds the permissible exposure limit (PEL) and engineering controls alone cannot reduce exposure below the PEL
• Employees work in oxygen-deficient atmospheres (below 19.5% oxygen)
• Employees enter immediately dangerous to life or health (IDLH) environments
• The employer requires respirator use for any reason, even if exposures are below the PEL
• Another OSHA substance-specific standard requires respiratory protection (e.g., 1926.1153 for silica, 1910.1025 for lead, 1910.1048 for formaldehyde)

A common trigger is Table 1 of OSHA 1926.1153 silica in construction. Many Table 1 tasks require respirators at certain durations, which pulls in the full 1910.134 program: written program, medical evaluation, fit testing, and training. Entry work brings the same result from a different direction. A permit space under OSHA 1910.146 confined spaces whose atmosphere is IDLH, or must be treated as IDLH because it cannot be characterized, puts the entrant and the rescue team under the (g)(3) IDLH procedures described above.

Section 1910.134(c) requires a written respiratory protection program with worksite-specific procedures. The written program is the first thing an OSHA inspector will ask for. Paragraph (c)(1) names nine elements it must include, and the numbering below follows the regulation so you can cite it directly:

Element six catches people out. It only bites once you run supplied-air respirators or SCBA, so a program built entirely around N95s and half masks has nothing to write there. Add an airline respirator later and the program needs that section before the equipment goes into service.

The three required steps — medical clearance must come before fit testing

Medical Evaluation

Before an employee can be fit tested or use a respirator on the job, the employer must provide a medical evaluation to determine the employee's ability to use a respirator. The evaluation uses the OSHA Respirator Medical Evaluation Questionnaire (Appendix C of 1910.134) or an equivalent initial medical exam.

• The employer pays all costs for medical evaluations
• Evaluations must be performed by a physician or other licensed health care professional (PLHCP)
• The questionnaire is confidential — the employer only receives a pass/fail determination and any limitations
• Must be completed before fit testing and before the employee uses a respirator in the workplace
• Follow-up exams are required if the PLHCP determines additional evaluation is needed
• A new evaluation is required if an employee reports signs or symptoms related to respirator use, a PLHCP or program administrator recommends one, or observations during fit testing suggest a medical issue

Fit Testing

All employees using tight-fitting respirators must be fit tested before initial use, whenever a different respirator facepiece is used, and at least annually thereafter. Fit testing must be performed with the same make, model, style, and size of respirator that the employee will use on the job.

The line between the two methods is the fit factor, not the shape of the mask. Paragraph (f)(6) allows QLFT only for negative-pressure air-purifying respirators that need a fit factor of 100 or less. A half mask carries an assigned protection factor of 10 and needs a fit factor of 100, so it can be qualitatively tested. A full facepiece relied on for its assigned protection factor of 50 needs a fit factor of 500, which is past the QLFT ceiling and has to go through QNFT.

Fit testing must be repeated annually and whenever there is a change that could affect respirator fit:

• Weight change of approximately 20 pounds or more
• Significant facial scarring, dental changes, or cosmetic surgery
• Different respirator make, model, style, or size
• Employee reports difficulty breathing or poor fit
• Visible changes in facial features that could affect seal

Employers must select NIOSH-certified respirators based on the respiratory hazards employees face. The Assigned Protection Factor (APF) tells you how much protection a respirator class provides. In plain terms, an APF of 10 means the respirator reduces the airborne concentration of a contaminant by a factor of 10 — so if the air outside the respirator contains 500 µg/m³ of a contaminant, the air inside the respirator should contain no more than 50 µg/m³.

The APFs below are the values in Table 1 of 1910.134. Two of them are conditional rather than fixed, which is where selection errors usually start.

Heat and Flame Resistant Respirators for Hot Work

Standard N95 filtering facepieces are not inherently flame resistant. In hot work environments like welding, grinding, cutting, and foundry operations, the respirator itself can melt, drip, or sustain flame if exposed to heat or sparks. Workers in these environments should select respirators tested for heat and flame resistance per ANSI/ISEA 110-2009 Section 7.11.1.

That test requires the respirator material to self-extinguish within 5 seconds of flame contact with no dripping, melting, or holes that would expose the lungs to contaminants.

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When an employee chooses to wear a respirator even though the employer does not require it and exposures are below the PEL, this is considered voluntary use. OSHA still has requirements, but they differ based on the type of respirator.

Respiratory protection has been on OSHA's Top 10 most frequently cited standards in recent years. It ranked fifth in fiscal year 2025, behind fall protection, hazard communication, ladders, and lockout/tagout. These are the mistakes that lead to citations most often.

• No written respiratory protection program — employees wear respirators but the employer has no written plan. This is the single most common citation under 1910.134.
• Skipping medical evaluations — employees are fit tested and sent to work with respirators without first completing the OSHA medical questionnaire and receiving PLHCP clearance.
• Fit testing before medical clearance — the medical evaluation must come first. An employee who is not medically cleared cannot be fit tested.
• Not fit testing annually — fit tests expire after 12 months. Many employers fit test at hire and never repeat it.
• Allowing facial hair with tight-fitting respirators — any facial hair that comes between the sealing surface of the facepiece and the face breaks the seal and voids the protection factor. Stubble, beards, sideburns, and mustaches that cross the seal line are all prohibited.

Any facial hair crossing the respirator seal line voids the protection factor

• Using expired or wrong cartridges — cartridges and filters have a service life. Employers must establish a change-out schedule based on the specific contaminant and concentration, or use end-of-service-life indicators.
• No training program — employees must be trained on why the respirator is necessary, how to properly don, doff, and adjust it, how to perform user seal checks, and how to recognize medical signs that limit respirator use. Training must occur before initial use and annually thereafter.
• Treating voluntary N95 use as fully exempt — when employees voluntarily use N95s, employers still must provide Appendix D. And if other (non-filtering-facepiece) respirators are also used voluntarily, medical evaluation is required for those.