Respiratory protection in 2026: choosing respirators and running a fit-tested programme

General information only, not medical or legal advice.

A respirator that does not seal to the face protects almost no one. That simple fact explains why respiratory protection is one of the most regulated categories of PPE — and why a box of masks on a shelf is not a programme. This guide covers respirator types, the logic of selection and the elements that make protection real.

The two main categories

There are two main categories of respirators: the air-purifying respirator, in which respirable air is obtained by filtering a contaminated atmosphere, and the air-supplied respirator, in which an alternate supply of breathable air is delivered.¹

Air-purifying respirators range from relatively inexpensive, single-use, disposable face masks, known as filtering facepiece respirators, reusable models with replaceable cartridges called elastomeric respirators, to powered air-purifying respirators (PAPR), which use a pump or fan to constantly move air through a filter and supply purified air into a mask, helmet or hood.¹ They filter particulates, gases, and vapors from the air¹.

Filters and the N95

In the United States, the National Institute for Occupational Safety and Health defines the categories of particulate filters according to their NIOSH air filtration rating.¹ The best-known is the N95, which meets the standard of filtering at least 95% of airborne particles that have a mass median aerodynamic diameter of 0.3 micrometers under 42 CFR 84, effective July 1995.⁴ The N95 respirator is commonly made of a fine mesh of synthetic polymer fibers, specifically a nonwoven polypropylene fabric.⁴ Europe uses different classes (FFP1–FFP3 under EN 149), so check the marking for the region where you operate.

Selection logic

Selection starts from the hazard: the contaminant, its form (particle, gas, vapour), its concentration and the oxygen level. According to the NIOSH Respirator Selection Logic, air-purifying respirators are recommended for concentrations of hazardous particulates or gases that are greater than the relevant occupational exposure limit but less than the immediately dangerous to life or health level and the manufacturer's maximum use concentration, subject to the respirator having a sufficient assigned protection factor.¹

There are hard limits: Air-purifying respirators are not effective during firefighting, in oxygen-deficient atmosphere, or in an unknown atmosphere; in these situations a self-contained breathing apparatus is recommended instead.¹ Confined spaces with uncertain atmospheres are a frequent example.

Fit testing and seal checks

Tight-fitting respirators must seal to the wearer’s face. Two different checks apply. A user seal check is done every time the respirator is put on: Filtering facepiece respirators are typically checked by cupping the hands over the facepiece while exhaling (positive pressure check) or inhaling (negative pressure check) and observing any air leakage around the facepiece.¹ This check is different from the periodic fit test that is performed using testing equipment.¹ HSE’s guidance covers When you need to fit test, how to fit test and maintaining equipment³. OSHA has added methods over time, including two new quantitative fit testing protocols to Appendix A of OSHA's Respiratory Protection Standard.²

Facial hair, weight changes and dental work can break the seal. Where workers cannot achieve a seal, loose-fitting PAPRs may be an option — PAPR respirators may not require this because they don't necessarily seal to the face.¹

Programme essentials

1. Exposure assessment to determine whether respirators are needed and what protection factor is required.
2. Medical evaluation of wearers; OSHA provides a Respirator Medical Evaluation Questionnaire Infosheet.²
3. Selection of approved respirators and filters for the hazard.
4. Fit testing before first use and periodically.
5. Training on donning, doffing and seal checks; OSHA publishes Seven Steps to Correctly Wear a Respirator at Work.²
6. Maintenance: cleaning, storage, cartridge change schedules and inspection.
7. Programme review with records.

Remember that respirators also add physiological load, which is why medical evaluation is required before use.

Buyer’s checklist

• Exposure assessment for each task, with contaminants, concentrations and oxygen level recorded.
• Required protection factor determined and respirator class selected accordingly.
• Approved respirators and filters for your region, with the approval marking checked on delivery.
• Multiple sizes and models so every wearer can achieve a fit.
• Fit-testing capability in house or through a competent provider.
• Cartridge change schedule and spare parts supply arranged.
• Cleaning and storage facilities for reusable respirators.
• Compatibility with eye protection, helmets and hearing protection.

Higher-level controls first

Respirators are demanding to use well. Before relying on them, look for ways to remove or reduce the contaminant: wet methods for dust, local exhaust ventilation at the source, enclosed processes and substitution of less hazardous materials. Each reduction in exposure lowers the protection factor needed and may remove the need for respirators altogether for some tasks.

Respirator categories

There are two main categories of respirators: the air-purifying respirator, in which respirable air is obtained by filtering a contaminated atmosphere, and the air-supplied respirator, in which an alternate supply of breathable air is delivered.¹ For atmospheres that are immediately dangerous to life or health, air-supplied equipment is needed; the term self-contained means that the SCBA is not dependent on a remote supply of breathing gas (e.g., through a long hose).⁷

In the US, filter performance is certified: National Institute for Occupational Safety and Health (NIOSH) N95 standard of air filtration, filtering at least 95% of airborne particles that have a mass median aerodynamic diameter of 0.3 micrometers under 42 CFR 84, effective July 1995.⁴ Europe and other regions use their own classes.

Running a respiratory protection programme

1. Exposure assessment: identify contaminants and concentrations, with an occupational hygienist if needed.
2. Selection: match the respirator type and filter to the contaminant and the required protection factor.
3. Medical evaluation: confirm workers can wear the respirator safely.
4. Fit testing: qualitative or quantitative tests for tight-fitting facepieces, at the start and periodically.
5. Training: donning, doffing and seal checks; OSHA's page lists guidance on Donning (Putting on) and Doffing (Taking off) and User Seal Checks.²
6. Maintenance: cleaning, storage, inspection, filter and cartridge change schedules.
7. Programme review: audits and worker feedback.

Common failures

• Facial hair under tight-fitting seals.
• Cartridges used beyond their service life.
• Disposable masks reused until damaged.
• One model for everyone, so many workers have a poor fit.

Key takeaways

• Choose air-purifying respirators only where oxygen is adequate and the atmosphere is known; otherwise use supplied air.
• Fit testing and seal checks are different, and both are needed for tight-fitting respirators.
• A respirator programme includes medical evaluation, training, maintenance and records.

Frequently asked questions

Is a surgical mask a respirator?

No. Surgical masks are designed mainly to protect against splashes and to reduce the wearer’s emissions. Respirators are designed and certified to filter airborne contaminants and, for tight-fitting types, to seal to the face.

How often is fit testing required?

Requirements vary by country. In the US, OSHA requires fit testing before first use and at least annually, and whenever changes could affect fit.

Can workers with beards wear tight-fitting respirators?

Facial hair under the seal prevents an effective fit. Options include being clean-shaven in the seal area or using loose-fitting powered respirators where appropriate.

When are cartridges changed?

Particulate filters are typically changed when breathing resistance increases or they are damaged. Gas and vapour cartridges need a change schedule based on the contaminant and conditions.

What is an assigned protection factor?

The expected workplace level of protection a properly functioning respirator provides to trained, fit-tested users. It is used to choose a respirator class for a given exposure.

Sources

Every factual statement marked with a number links to the source below. Sources were retrieved on 23 October 2026; check the publisher for later revisions.

1. Respirator (Wikipedia) en.wikipedia.org
2. Respiratory Protection (OSHA) osha.gov
3. Respiratory protective equipment (HSE) hse.gov.uk
4. N95 respirator (Wikipedia) en.wikipedia.org
5. Personal Protective Equipment (OSHA) osha.gov
6. 29 CFR 1910.132 General requirements (OSHA) osha.gov
7. Self-contained breathing apparatus (Wikipedia) en.wikipedia.org