OSHA 29 CFR 1910.134 Respiratory Protection Standard

What does OSHA 29 CFR 1910.134 require for respiratory protection programs?

Published June 10, 2026 · Last updated July 27, 2026

Short answer: OSHA 29 CFR 1910.134 is the general industry respiratory protection standard. It requires employers to establish a written respiratory protection program whenever respirators are used — whether required or voluntarily worn — with specific provisions covering NIOSH-approved respirator selection, medical evaluation, annual fit testing, user seal checks, cartridge change-out schedules, training, and recordkeeping. The standard was substantially revised in 1998 and remains the foundational regulatory document that all other OSHA respiratory protection requirements reference or incorporate. Construction employers comply with 1910.134 through 29 CFR 1926.103, which defers directly to it.

OSHA 29 CFR 1910.134: The Respiratory Protection Standard (2026 Guide)

Every respiratory protection program in the United States — across general industry, construction, maritime, and federal contractor operations — is built on the framework established by 29 CFR 1910.134. This standard, promulgated in its current form in January 1998 after more than two decades of development, defines the legal minimum for every element of a respiratory protection program: the written program structure, the process for selecting NIOSH-approved respirators matched to specific hazards, the medical evaluation required before a worker wears a required respirator for the first time, the annual fit testing obligation, the user seal check protocol, cartridge change-out documentation, and the training and recordkeeping that holds the program together.

This guide is for EHS managers, safety directors, plant managers, and anyone responsible for building or auditing a respiratory protection program. It covers the full 1910.134 section structure, the Assigned Protection Factor (APF) table and Maximum Use Concentration (MUC) calculation used for respirator selection, each mandatory appendix, the most commonly cited compliance failures, and a step-by-step worked example that walks through implementing a compliant program for a manufacturing maintenance operation with both organic vapor and particulate hazards.

Scope of this standard.
1910.134 applies to all general industry employers covered by OSHA's Part 1910 standards whenever respirators are used in the workplace. Construction employers comply through 29 CFR 1926.103, which requires compliance with all of 1910.134. Maritime employers comply through 29 CFR 1915.154 and 1917.92, which also incorporate 1910.134 by reference. Federal contractors covered by OSHA standards must comply with 1910.134 applicable to their industry sector. The standard has 13 operative sections (§§1910.134(a)–(m)) plus five mandatory appendices (A–D, with Appendix E informational).

What is OSHA 29 CFR 1910.134 and how did it develop?

29 CFR 1910.134 is located in OSHA's General Industry Safety and Health Standards, Title 29, Code of Federal Regulations, Part 1910, Subpart I (Personal Protective Equipment). The standard traces its origins to OSHA's initial standards set in 1971, which incorporated existing national consensus standards for respirators from that era. For more than 25 years, the 1971 respiratory protection standard remained largely unchanged while respirator technology, industrial hygiene practice, and understanding of occupational respiratory disease advanced substantially.

The 1998 revision — which remains the operative version today — overhauled the standard in several fundamental ways: it introduced the written program requirement as the administrative backbone, added formal medical evaluation requirements for required-use programs, established the fit testing obligation as a specific annual requirement with accepted protocol methods, introduced the APF table as a quantitative selection tool, and addressed voluntary use specifically. The 1998 revision drew heavily on the consensus standard ANSI/AIHA Z88.2-1992 — see the ANSI/ASSP Z88.2 respiratory protection program standard guide for the relationship between the two documents.

A significant post-1998 amendment was the 2006 Final Rule on Assigned Protection Factors, which formally added the APF table to 1910.134(d)(3)(i)(A). Prior to 2006, APF values existed in OSHA guidance documents but were not part of the binding regulatory text. The 2006 rule codified the APF table and the MUC calculation method, establishing them as mandatory elements of respirator selection rather than recommended practice.

When does 1910.134 apply? Required use vs. voluntary use

1910.134(a)(1) establishes the basic permissible practice: in the workplace where feasible engineering and administrative controls do not adequately reduce employee exposure to harmful levels, respirators shall be used. The standard applies in two distinct scenarios with very different compliance obligations:

Required use

Respirators are required when: (a) engineering controls (ventilation, substitution, enclosure) cannot reduce employee exposure to or below the applicable OSHA PEL or action level; or (b) a substance-specific standard mandates respiratory protection at or above a specified concentration threshold. When respirators are required, the full 1910.134 program applies: written program, NIOSH-approved equipment, medical evaluation, fit testing, training, and recordkeeping. Employers cannot require workers to provide their own respirators for required-use programs — the employer must provide them at no cost.

Voluntary use

When a respirator is not required by OSHA but an employee wants to wear one, voluntary use provisions apply under §1910.134(c)(2):

• Filtering facepieces only (e.g., N95 disposables): The employer must provide the user with the information in Appendix D — a one-page document explaining the respirator's limitations and the importance of proper use. No written program, medical evaluation, or fit testing is required.
• Any other respirator (half-face APR, full-face APR, PAPR, etc.): The employer must implement a written program per §1910.134(c), ensure the respirator does not itself create a hazard, and conduct medical evaluations. Fit testing is required for tight-fitting facepieces. The full administrative infrastructure applies.

The practical implication: allowing workers to keep half-face APRs in their toolboxes for "whenever they want to use one" without a written program, medical evaluations, and fit test records is a 1910.134 violation — even if the task does not require respiratory protection. The program obligation follows the equipment type, not the hazard level.

The written respiratory protection program — §1910.134(c)

The written respiratory protection program (WRPP) is the administrative backbone of every 1910.134-compliant program. §1910.134(c)(1) requires the WRPP to include worksite-specific procedures for each of the following elements:

The WRPP must be worksite-specific — a generic template downloaded from a safety organization does not satisfy 1910.134(c)(1) unless it has been customized to identify the specific hazards present, the specific NIOSH-approved equipment in use, and the procedures applicable to that workplace. The WRPP must be available to all employees covered by the program and to OSHA inspectors on request. A program administrator designated under §1910.134(c)(1) must be suitably trained to administer the program. For guidance on program administrator qualification criteria beyond the 1910.134 minimum, see the ANSI/ASSP Z88.2 guide.

Respirator selection: APF table, MUC, and NIOSH approval — §1910.134(d)

§1910.134(d) establishes three parallel selection requirements that must all be satisfied simultaneously: the respirator must be NIOSH-approved, it must provide a level of protection matched to the hazard through the APF and MUC framework, and it must be appropriate for the specific work environment and user characteristics.

NIOSH approval requirement

§1910.134(d)(1)(ii) requires that all respirators used in required programs be NIOSH-certified. This means the respirator must carry a valid TC-84A (or equivalent) approval number on the facepiece, cartridge, and packaging, and that approval must be verifiable on the NIOSH Certified Equipment List (CEL). See the NIOSH 42 CFR Part 84 respirator certification guide for the full certification framework, N/R/P classification, and step-by-step CEL verification. Dust masks, surgical masks, and comfort face coverings are not NIOSH-certified respirators and do not satisfy this requirement.

Assigned Protection Factors and Maximum Use Concentration

The APF is the minimum workplace level of respiratory protection expected from a properly worn, fitted, and trained respirator class. The MUC is calculated as APF × applicable OEL — it is the highest airborne concentration at which a given respirator is permitted for use. Selecting a respirator with an MUC below the measured or estimated exposure concentration is a §1910.134(d)(3) violation regardless of the respirator's NIOSH approval class.

APF values apply only to properly fitted and worn respirators — a worker without a current fit test, without medical clearance, or who has not performed a user seal check does not receive the benefit of the stated APF. The employer cannot simply specify a full-face APR (APF 50) and assume the protection level is achieved without the surrounding program infrastructure. Browse the 3M full-face mask respirator lineup — APF 50 — for the equipment specification; the program infrastructure is what activates the APF claim.

Cartridge and filter selection

§1910.134(d)(1)(iii) requires that the respirator selected be appropriate for the chemical state and physical form of the contaminant. For particulate hazards, the filter efficiency class (N, R, or P at 95, 99, or 100%) must be matched to the oil aerosol content of the atmosphere — the NIOSH 42 CFR Part 84 N/R/P classification guide covers this in detail. For gas/vapor hazards, the cartridge sorbent must be appropriate for the contaminant: organic vapor (OV) cartridges like the 3M 6001 for solvent vapors; acid gas cartridges for HCl, SO₂, or HF; combination cartridges for mixed-hazard environments. When both particulate and vapor hazards are present — spray painting with solvent-based coatings, welding on coated steel, abrasive blasting — a combination OV/P100 or multi-gas/P100 cartridge is required. The 3M respirator cartridges and filters lineup covers the full spectrum from particulate-only P100s through combination multi-gas/P100 configurations.

Cartridge change-out schedule — §1910.134(d)(3)(iii)(B)

For atmosphere-purifying respirators with cartridges subject to end-of-service-life considerations (primarily OV and combination cartridges), §1910.134(d)(3)(iii)(B) requires a change-out schedule based on "objective information or data that will ensure that sorbent cartridges and canisters are changed before the end of their service life." This requirement is frequently cited because employers document a schedule ("change at end of shift") without documenting the objective basis for that interval. The acceptable basis for a change-out schedule is: manufacturer service-life data, OSHA CARB data, or a mathematical service-life calculation accounting for contaminant concentration, breathing rate, temperature, and humidity. See the ANSI/ASSP Z88.2 guide for the ESLI and calculation methodology that satisfies this requirement in detail.

Medical evaluation — §1910.134(e) and Appendix C

§1910.134(e) requires medical evaluation before a worker wears a required respirator for the first time. The evaluation must be conducted by a Physician or Licensed Health Care Professional (PLHCP) — defined in §1910.134(b) as an individual whose legally permitted scope of practice allows them to independently provide the health care services required by the standard. The employer is responsible for providing the medical evaluation at no cost to the employee and during normal working hours or at a convenient time.

The Appendix C questionnaire process

The medical evaluation begins with OSHA Appendix C — a mandatory written questionnaire that employees complete privately and submit directly to the PLHCP. The questionnaire covers cardiovascular and pulmonary health history, current symptoms, and relevant medication use. The employer does not see the questionnaire responses — only the PLHCP's written recommendation, which states whether the employee is cleared to wear the specified respirator type, cleared with restrictions, or not cleared.

Fit testing — §1910.134(f) and Appendix A

§1910.134(f) requires fit testing for all tight-fitting respirators used in required programs. Fit testing must be performed before initial use and annually thereafter, and must be repeated when the employee reports, or the employer observes, changes in the employee's physical condition that could affect respirator fit. Fit testing must be conducted using an Appendix A-accepted protocol on the specific respirator model the employee will use — a fit test on one manufacturer's half-face respirator does not cover a different manufacturer's model, and a fit test on a medium-size facepiece does not cover a large.

Qualitative fit test (QLFT) protocols — Appendix A

OSHA Appendix A accepts four qualitative fit test protocols. All four test whether the subject can detect a challenge agent introduced into the test enclosure around their facepiece:

• Isoamyl acetate (banana oil): Olfactory detection. Cannot be used for workers who cannot detect the odor of isoamyl acetate at a concentration below its TLV/OEL.
• Saccharin solution aerosol: Sweet taste detection. Worker must be able to taste saccharin to use this protocol.
• Bitrex (denatonium benzoate) solution aerosol: Bitter taste detection. The most widely used QLFT protocol; suitable for most workers.
• Irritant smoke (stannic chloride): Detects visible leakage; used as a screening protocol only — not suitable as the sole QLFT for all facepiece sizes.

Qualitative protocols are limited to respirators with an APF of 10 or below — they cannot be used to fit-test full-face APRs (APF 50) or higher-APF equipment.

Quantitative fit test (QNFT) protocols — Appendix A

Quantitative protocols measure the actual particle count inside vs. outside the facepiece and calculate a fit factor. They are required for full-face APRs and are used when a higher confidence in fit factor is needed. Appendix A accepts three QNFT protocols: generated aerosol (using a PortaCount or similar instrument), condensation nuclei counter (CNC), and controlled negative pressure (CNP). The minimum acceptable fit factor under Appendix A is 100 for half-face respirators and 500 for full-face respirators. Fit factor is not the same as APF — a measured fit factor of 500 does not give an APF of 500; the APF is set by respirator class, not by individual fit test result.

Respirator use — §1910.134(g)

User seal checks — §1910.134(g)(1)

§1910.134(g)(1)(ii) requires that employees perform a user seal check each time they put on a tight-fitting respirator. Two seal check methods are described in mandatory Appendix B-1: the positive pressure check (exhale gently; if facepiece bulges slightly and no outward leakage is detected, fit is adequate) and the negative pressure check (inhale sharply; if facepiece collapses slightly and no inward leakage is detected, fit is adequate). User seal checks are not the same as fit testing — they are a daily pre-use verification that the respirator is properly donned. They must be performed every time a respirator is donned, not just at the start of a shift.

Facial hair — §1910.134(g)(1)(i)

§1910.134(g)(1)(i) prohibits use of a tight-fitting facepiece by any employee who has facial hair that comes between the sealing surface and the face, or that interferes with valve function. This prohibition applies to stubble, beard, sideburns that contact the seal, and goatees. There is no "de minimis" stubble allowance in the standard — any stubble that contacts the sealing surface is non-compliant. Workers with facial hair who require respirator protection must use a loose-fitting facepiece (PAPR with hood or helmet) that does not require a facial seal.

IDLH atmospheres — §1910.134(g)(2)

§1910.134(g)(2) requires that in IDLH (Immediately Dangerous to Life or Health) atmospheres, the employer provide a pressure-demand SCBA or a combination pressure-demand supplied-air respirator with auxiliary SCBA. At least one standby employee must be located outside the IDLH atmosphere with two-way communication to the interior, and rescue equipment must be available. No air-purifying respirator — regardless of filter class or APF — may be used in IDLH conditions.

Related reference

See also the OSHA 1910 and 1926 index — the frozen-edition table, and why “ANSI compliant” and “OSHA compliant” are not the same thing.

Neighbouring references on this site: when does osha require a respirator, ANSI/ASSP Z88.2 Respiratory Protection Program Standard, what is rpe respiratory protective equipment, written respiratory protection program requirements, how to choose a respirator cartridge: complete selection guide, and respirator cartridge change out schedule.

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Researched and written by Steven Eaton, editor of WC Safety. Steven holds no safety certification and does not test products; this page compares what manufacturers and regulators publish, with the gaps in that record marked. Last reviewed August 2026.

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