Which masks protect you from smoke and pollution?

Short answer. Against smoke and particle pollution, only a sealed respirator protects: a NIOSH-approved N95 filters at least 95% of airborne particles ³, an Australian P2 about 94% of fine PM2.5 ⁸, and a European FFP2 at least 94% of test aerosols ⁶. None of them filters the gases in smoke ². Cloth and surgical masks do not seal to the face and do not protect against smoke ²⁸.

What do the labels N95, FFP2, P2 and KN95 mean?

They are national ratings for the same kind of product: a disposable particle mask meant to seal to the face.

Filtration on paper is not protection on your face. The UK Health and Safety Executive states it in practical terms: FFP1, FFP2 and FFP3 masks cut the dust you breathe by factors of 4, 10 and 20, and only "if the respirator is a good fit" and used correctly ⁵.

What do these masks not filter?

Gases. The Public Health Agency of Canada says a respirator "doesn't protect against the gases in smoke" ². Victoria's guide says no mask on its list protects against gases and vapours ⁸, and the HSE says FFP masks filter dust only and must not be used where there are harmful gases or vapours or too little oxygen ⁵.

The same holds for pollution: a respirator cuts fine particles on a bad air day, not the gases. Staying indoors with clean air remains the first measure; the EPA presents the respirator for when you have to be outside ¹. Our wildfire smoke guide covers the clean-air room and air cleaners, and the volcanic ash guide covers ash and goggles.

Why don't cloth and surgical masks work?

Because air goes around them. NIOSH describes the surgical mask as loose-fitting and states that it "does NOT provide the wearer with a reliable level of protection from inhaling smaller airborne particles and is not considered respiratory protection" ³.

The Public Health Agency of Canada says cloth, medical and surgical masks "don't fit the face well" and may not filter smoke well, and that a scarf, bandana, neck gaiter or face shield "won't protect you against wildfire smoke" ².

How do you know a mask fits?

Every agency puts the seal first. A respirator should cover your nose, mouth and chin ² and fit over the nose and under the chin ¹. Leakage at the edges lets unfiltered air in ¹.

Each time you put one on, NIOSH requires a user seal check ³. The HSE describes a simple version: adjust the straps and nose strip as the maker instructs, then breathe in and out sharply; if you feel air leaking or your glasses steam up, readjust ⁵. Canada adds that no air should escape the edges when you breathe out ². If one size or model leaks, try another ¹.

A seal check is not a fit test. The HSE says "the only way you can know if the seal is good enough is by having a proper respirator fit test," and that this is at present the only way of meeting legal requirements at work ⁵. For households, the seal check is the realistic standard.

Choose head straps over ear loops: the EPA warns that masks with one strap, or two straps around the ears, are not designed to seal tightly ¹.

Can you wear one with a beard?

Not effectively. The EPA says "a good seal is not possible with facial hair" ¹. The HSE says a mask that depends on face fit is "useless if you have a beard or thick beard stubble" ⁵. NSW Health tells people with a beard to shave before using a P2/N95 ⁷.

How long can you wear the same mask?

These are disposable products, and the agencies give limits rather than an hour count for the public:

• Replace it when it is dirty, damp or damaged ², when it becomes moist or hard to breathe through ⁷, or when it no longer seals or is deformed ³.
• After each use, say NSW Health and Victoria ⁷⁸. Victoria explains that a respirator becomes less effective as it loads up with particles ⁸.
• At work, the HSE says to discard it at the end of the shift or sooner, and never to hang it up in a dusty place for later ⁵. Germany's occupational guidance (BAuA and DGUV rule 112-190) generally limits FFP2 wear to 75 minutes followed by a 30-minute break, longer for light work ⁶.
• Not while sleeping, because it will not stay sealed ².

What about children?

This is where agencies differ most. The EPA and the Public Health Agency of Canada set the floor at age 2: no respirator under 2 years ¹². The EPA adds that NIOSH-approved respirators "do NOT come in sizes suitable for young children," so adults should watch any child wearing one ¹. Australian health departments go further: NSW Health says P2/N95 masks are not designed for children's smaller faces ⁷, and Victoria says respirators are not designed for children ⁸.

For children, the wildfire smoke guide covers the clean-air room.

Who should ask a doctor first?

People with heart or lung disease, and pregnant people. The EPA says to ask your doctor before using a respirator if you have heart or lung problems or are pregnant ¹. NSW Health says a P2/N95 can make it harder to breathe for people with a heart or lung condition and advises speaking to a doctor first ⁷.

If breathing becomes difficult, Victoria's advice is to move away from the hazard, then remove the respirator, and to seek medical advice if the difficulty continues ⁸.

How do you spot a counterfeit?

NIOSH keeps the Certified Equipment List, its official list of approved respirators; check that the model name and approval number on the mask match an entry ⁴. Its warning signs include listings that insist a product is "genuine," prices that seem too good to be true, "unlimited stock" during a shortage, and sites with typos or free email addresses ⁴. In Europe, German authorities have urged buyers to look for the CE mark with the four-digit number of the notified body, printed with the test standard on the mask ⁶.

What official agencies recommend

• United States (EPA, CDC/NIOSH). A fitted NIOSH-approved N95 or P100 when you must be outdoors in smoke ¹; verify approval on the Certified Equipment List ⁴.
• Canada (Public Health Agency of Canada). A well-fitting N95, KN95 or KF94; not under age 2; it does not stop gases ².
• United Kingdom (HSE). EN 149 FFP masks, CE marked; protection factors of 4, 10 and 20 only with a good fit ⁵.
• Germany and the EU. FFP2 at least 94% and FFP3 at least 99% under EN 149; check the CE mark and notified-body number ⁶.
• Australia (NSW Health, Victoria). A sealed P2/N95, replaced after each use; not designed for children; ask a doctor with heart or lung disease ⁷⁸.

Where they differ: the U.S. and Canada allow respirators from age 2 ¹², while Australian states say they are not designed for children ⁷⁸. Canada accepts ear loops ²; the EPA warns against them ¹.

Frequently asked questions

Is an FFP2 the same as an N95?

They are close but certified under different systems: NIOSH requires at least 95% filtration for an N95 ³, EN 149 at least 94% for an FFP2 ⁶. Either only works if it seals to your face ⁵⁸.

Do valved masks still filter smoke?

Yes. Victoria says exhalation valves do not change how well a respirator filters incoming particles, but they let your breath out unfiltered, so they are not suitable where infection control matters ⁸.

Will a respirator protect me from pollution on a smog day?

It reduces the fine particles you inhale if it seals well ³⁸, but it does not filter gases ²⁸. Reducing time and effort outdoors still comes first ¹.

Air quality and its risks vary by place; see the air page, country by country.

Your household's air risks, in your plan

The Phaenyx plan's "Water and air" section lists the water and air risks for your postal code, so you know which masks your household needs before smoke arrives. The Phaenyx Safe app keeps the reflex sheets offline. Build your Phaenyx plan.

Sources

1. U.S. Environmental Protection Agency (EPA) — Protect Yourself From Wildfire Smoke and Ash — https://www.epa.gov/wildfires/protect-yourself-wildfire-smoke-and-ash (accessed 2026-10-27)
2. Public Health Agency of Canada — Using a respirator mask during wildfire smoke events — https://www.canada.ca/en/public-health/services/publications/healthy-living/using-respirator-mask-during-wildfire-smoke-events.html (accessed 2026-10-27)
3. U.S. CDC, National Institute for Occupational Safety and Health (NIOSH) — Understanding the Difference: Surgical Mask and N95 Respirator (2021) — https://stacks.cdc.gov/view/cdc/181826 (accessed 2026-10-27)
4. U.S. CDC, National Institute for Occupational Safety and Health (NIOSH) — Counterfeit/Misrepresented Respirators — https://www.cdc.gov/niosh/ppe/counterfeit_respirators/index.html (accessed 2026-10-27)
5. Health and Safety Executive (HSE), United Kingdom — All you need to know about disposable dust masks — https://www.hse.gov.uk/agriculture/dustmasks.htm (accessed 2026-10-27)
6. Deutscher Bundestag, Wissenschaftliche Dienste (Germany) — Zu Verwendung, Nutzen und Sicherheit von FFP2-Masken (WD 9 - 3000 - 004/22) — https://www.bundestag.de/resource/blob/896068/a5c8a2e1297dafa40932db20b903dae6/WD-9-004-22-pdf-data.pdf (accessed 2026-10-27)
7. NSW Health (Australia) — P2/N95 masks — https://www.health.nsw.gov.au/environment/factsheets/Pages/face-mask.aspx (accessed 2026-10-27)
8. Better Health Channel, Department of Health, Victoria (Australia) — Face masks for environmental hazards — https://www.betterhealth.vic.gov.au/healthy-living/face-masks-environmental-hazards (accessed 2026-10-27)