OSHA 29 CFR 1910.134: Respiratory Protection Program
Requirements for written programs, medical evaluation, fit testing, and respirator selection in general industry and construction
Last updated: March 13, 2026
Overview
OSHA 29 CFR 1910.134 is the federal standard that governs respiratory protection in all workplaces. It applies to every general industry and construction employer where 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 applies across industries: manufacturing, construction, healthcare, laboratories, welding shops, painting operations, pharmaceutical production, foundries, and any workplace where airborne contaminants or oxygen-deficient atmospheres exist. If your workers wear respirators for any reason, this standard applies to you.
When Is a Respiratory Protection Program Required?
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)
Voluntary use is not exempt. Even when employees choose to wear respirators on their own (and the employer does not require them), OSHA still imposes some requirements. For voluntary use of filtering facepieces (dust masks), employers must provide a copy of Appendix D. For voluntary use of all other respirator types, employers must provide medical evaluations and ensure the respirator does not create a hazard. See the Voluntary Use section below.
A common trigger is Table 1 of OSHA 1926.1153 (silica in construction). Many Table 1 tasks require respirators at certain durations, which automatically triggers the full 1910.134 respiratory protection program requirements — written program, medical evaluation, fit testing, and training.
Written Program Elements
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. Here is what it must include:
Required Written Program Elements
- Procedures for selecting respirators appropriate to the hazards employees are exposed to
- Medical evaluations for employees required to use respirators
- Fit testing procedures for employees wearing tight-fitting respirators
- Procedures for proper use of respirators in routine and reasonably foreseeable emergency situations
- Procedures for IDLH atmospheres including buddy systems, standby personnel, and communication
- Maintenance and care — cleaning, disinfecting, storing, inspecting, repairing, discarding, and otherwise maintaining respirators
- Training on respiratory hazards, proper use, maintenance, and limitations of respirators
- Procedures for regularly evaluating the effectiveness of the program
- Work area surveillance to ensure controls are working and respirators are being used correctly
- Recordkeeping — medical evaluations, fit test results, and the written program itself
Program administrator: The employer must designate a program administrator who is qualified by appropriate training or experience to administer the program and conduct required evaluations. This person is responsible for the day-to-day operation of the program.
Medical Evaluation & Fit Testing
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.
| Method | Equipment Cost | Time per Test | Pass/Fail Criteria | Best For |
|---|---|---|---|---|
| QLFT (Qualitative) | Low ($200-$500 for kit) | 15-20 minutes | Employee detects taste or smell of test agent (pass = no detection) | Half-face respirators and filtering facepieces (N95s). Cannot be used for full-face respirators. |
| QNFT (Quantitative) | High ($5,000-$15,000 for instrument) | 15-30 minutes | Instrument measures fit factor numerically (pass = fit factor meets or exceeds required level) | Any tight-fitting respirator including full-face. Required for full-face if using QNFT protocol. |
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
Respirator Selection & Assigned Protection Factors
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.
Respirator types and their OSHA Assigned Protection Factors (APF) per 1910.134 Table 1
| Respirator Type | APF | Notes |
|---|---|---|
| Filtering facepiece (N95, P100) | 10 | Disposable, single-use. Most common for dust, mist, and fume exposures up to 10x the PEL. |
| Elastomeric half-face respirator | 10 | Reusable with replaceable cartridges/filters. Same APF as filtering facepiece but more durable and cost-effective for repeated use. |
| Elastomeric full-face respirator | 50 | Covers entire face. Provides eye protection. Required when exposures exceed 10x PEL or eye irritation is a concern. |
| PAPR with half-face | 50 | Powered air-purifying respirator. Battery-powered blower forces air through filters. Easier to breathe in than negative-pressure respirators. |
| PAPR with full-face, helmet, or hood | 1,000 | Loose-fitting hoods and helmets do not require fit testing. Good option for employees with facial hair or difficulty achieving a seal. |
| Supplied-air respirator (SAR) | 10 – 10,000 | APF varies by facepiece type and operating mode (demand, continuous flow, pressure-demand). Required for IDLH and oxygen-deficient environments. |
How to use APF: Divide the measured or estimated airborne contaminant concentration by the PEL. The result is the minimum protection factor you need. Choose a respirator with an APF equal to or greater than that number. For example, if exposure is 250 µg/m³ and the PEL is 50 µg/m³, you need a minimum APF of 5 — an N95 (APF 10) would be sufficient. If exposure is 2,000 µg/m³, you need APF 40 — a full-face respirator (APF 50) would work.
Voluntary Use & Appendix D
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.
Filtering Facepieces (Dust Masks / N95s)
- Employer must provide the employee a copy of Appendix D of 1910.134 (information for voluntary use)
- No medical evaluation required
- No fit testing required
- No written program required for this use alone
- Employer must ensure the respirator itself does not create a hazard (e.g., is not contaminated or damaged)
All Other Respirators (Half-Face, Full-Face, PAPR, SAR)
- Employer must provide medical evaluation before use
- Employer must ensure the respirator is properly cleaned, stored, and maintained
- Employer must ensure the respirator does not create a hazard
- Fit testing is not explicitly required for voluntary use but is strongly recommended
Common example: An employee on a construction site wants to wear an N95 for comfort during dusty demolition work, but air monitoring shows dust levels are below the PEL. The employer must give the employee a copy of Appendix D but does not need to provide medical evaluation or fit testing for the N95 alone. However, if that same employee also uses a half-face elastomeric respirator for a different task, the employer must provide medical evaluation for the half-face use — and at that point, a full written program is likely triggered.
Common Mistakes
Respiratory protection is consistently one of the top three most-cited OSHA standards every year. 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.
Enforcement context: OSHA 1910.134 consistently ranks as one of the top three most frequently cited standards across all industries. Violations are often grouped — a single inspection can result in citations for missing written program, missing medical evaluations, missing fit testing, and missing training, each as a separate violation.
Frequently Asked Questions
Do I need a respiratory protection program for N95 dust masks?
It depends on whether the use is required or voluntary. If the employer requires employees to wear N95s (or if an OSHA standard like 1926.1153 requires them), then yes — a full written respiratory protection program is required, including medical evaluation, fit testing, and training. If employees choose to wear N95s voluntarily and the employer does not require them, the employer only needs to provide a copy of Appendix D.
How often is fit testing required?
At least annually (every 12 months). Additional fit testing is required whenever an employee switches to a different respirator make, model, style, or size, or whenever there is a change in the employee's physical condition that could affect respirator fit — such as significant weight change (approximately 20 pounds), facial scarring, dental changes, or cosmetic surgery.
Can employees have facial hair and wear a respirator?
Not with tight-fitting respirators. Section 1910.134(g)(1)(i)(A) prohibits tight-fitting facepieces when facial hair comes between the sealing surface and the face or interferes with valve function. This includes beards, stubble, sideburns, and mustaches that cross the seal line. Employees with facial hair can use PAPRs with loose-fitting hoods or helmets, which do not rely on a facial seal.
Who pays for medical evaluations and fit testing?
The employer. Section 1910.134(d)(1)(iv) requires the employer to provide medical evaluations and fit testing at no cost to the employee. This includes the cost of the evaluation itself, any follow-up exams recommended by the PLHCP, and reasonable time and travel.
What is the difference between QLFT and QNFT?
Qualitative fit testing (QLFT) uses a test agent — typically Bitrex (bitter taste), saccharin (sweet taste), isoamyl acetate (banana smell), or irritant smoke — and relies on the employee's ability to detect it. If the employee tastes or smells the agent, the test fails. Quantitative fit testing (QNFT) uses an instrument (such as a PortaCount) to measure the actual concentration of particles inside and outside the respirator, producing a numerical fit factor. QLFT is less expensive but can only be used for half-face respirators and filtering facepieces. QNFT can be used for any tight-fitting respirator.
Do I need fit testing for PAPRs?
Only for tight-fitting PAPRs (those with a half-face or full-face piece that seals against the face). Loose-fitting PAPRs with hoods or helmets do not require fit testing because they do not rely on a facial seal for protection. This makes loose-fitting PAPRs a practical option for employees who have facial hair or difficulty achieving a reliable seal with tight-fitting respirators.
What records do I need to keep?
Three categories of records: (1) Medical evaluation records must be retained and made available per 29 CFR 1910.1020 (for the duration of employment plus 30 years). (2) Fit test records must include the employee name, type of fit test, specific make/model/style/size of respirator, date of test, and pass/fail result — retained until the next fit test. (3) A current copy of the written respiratory protection program must be maintained and made available to employees.
Can one employee use another employee's respirator?
No. Respirators must be individually assigned. Each employee must be fit tested on the specific make, model, style, and size of respirator they will use. Sharing respirators means the second employee has not been fit tested on that unit and there is no assurance of proper fit. Additionally, respirators must be cleaned and disinfected before being used by another person, and reusable respirators assigned to individual employees must be cleaned and disinfected as often as necessary to maintain sanitary condition.
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