Anti-Pollution Gear for Motorcycle Riders: Masks, Filters and Purifiers Compared

Part of our Masks vs filters guide.

Put on a mask, then pull a full-face helmet over it. The chin bar presses the bottom edge, and by the first set of lights you can feel air coming in around the sides.

That gap is what this guide is about. Every option below is graded on filtration, helmet fit, seal, comfort and cost.

Riders breathe more traffic pollution than almost anyone

You sit in the open, at exhaust height, often filtering between lanes. In a study of commuters in a motorcycle-dominated city, motorcyclists had the highest in-transit particle exposure of any mode measured, ahead of bus and car passengers.

Car drivers can close the windows. A six-mode commuting study measured the PM2.5 dose each person inhaled over one route:

A rider sits at the exposed end of that range, with no cabin to hide in (PLOS ONE commuting study).

The WHO links 4.2 million early deaths a year to outdoor air pollution, driven mostly by fine particles that lodge deep in the lungs and reach the blood.

The WHO's 2021 guideline puts the safe yearly average for PM2.5 at 5 µg/m³, a level about 99% of the world's population already exceeds. For the full picture, see our motorcycle air pollution guide.

You have five kinds of gear to choose from

From cheapest to most capable: cloth masks, surgical masks, N95 or FFP2 respirators, dedicated anti-pollution masks, and active purifiers that mount on the helmet.

Don't pick on the biggest number on the box. Pick on what keeps working at 50 km/h inside a helmet.

Ride with filtered air

Filters haze PM2.5 on every ride

Easi Breezi mounts on your scooter or motorbike and feeds H11 HEPA-filtered air into your helmet. Bike-powered, no batteries, no charging.

See the Easi BreeziHow it works

Only one option doesn't need a face seal

Filtration figures are each product's own claim or the relevant standard, sourced below. The fit and seal columns are what marketing rarely mentions.

N95 and FFP2 masks filter well until you start riding

An N95 is certified to filter at least 95% of particles at 0.3 µm, the hardest size to catch. Independent testing measured N95 and KN95 masks at 83 to 99% at that size. That's excellent filter material.

But the rating assumes a perfect seal, and two things break it on a bike:

• Movement. A fit study found that talking and bending lowered the fit factor compared with still breathing. Riding is constant head turns and jaw motion.
• Breathing load. N95s add breathing resistance, and research links them to more carbon dioxide rebreathed from the space inside the mask.

An N95 is a fair stopgap for a short ride. It was designed for a still worker in a clinic.

Surgical masks help a little, cloth masks hardly at all

Measured at 0.3 µm, surgical masks filter 42 to 88%, cloth masks 16 to 23%, and a bandana about 9%.

Both fit loosely, so wind at speed undercuts even that modest filtration.

Still, a damp cloth mask under a helmet is the weakest option here. Our guide to pollution masks for motorcycle riders goes through the trade-offs mask by mask.

Dedicated masks are the best masks a rider can buy

• R-PUR says its motorcycle mask blocks up to 99.98% of fine particles, beyond the FFP3 standard. Its memory-foam seal is designed for full-face and modular helmets.
• Airinum's Urban Air Mask was tested at a Swedish research institute to 98% at 0.3 µm and 99.99% against PM2.5.
• Respro's Techno filter uses a HEPA-type layer plus activated charcoal, rated to trap 95% of airborne particles down to below 0.1 µm.

If you're set on a mask, buy one of these. There are two catches. The first is running cost.

Airinum filters last around 100 hours and should be replaced about every two weeks, and R-PUR replacement filters cost about 30 US dollars each.

The second matters more. Every one of them still relies on a seal against your face, and that's what fails on a motorcycle.

Activated carbon helps with gases, if the air goes through it

Exhaust also carries gases such as nitrogen dioxide, sulphur dioxide and volatile organic compounds (VOCs), which a particle filter alone doesn't catch.

Here the mask brands earn credit. Respro pairs its particle layer with a DACC activated-charcoal layer that adsorbs SO₂ and NO₂ and filters VOCs. R-PUR uses activated carbon to neutralise some toxic gases and VOCs.

But carbon saturates over time, which is partly why every filter has a replacement schedule. And it only treats air that passes through it. If the seal leaks at speed, gases go around it just like particles do.

For most daily riders, fine particles are the biggest measurable exposure. Get filtered air to your lungs first. Gas adsorption is a bonus.

Every mask shares one flaw: the seal breaks when you ride

A mask only filters air that is forced through the filter. That only happens if the mask forms an airtight gasket against your skin.

Foam and nose clips manage it on a still face in a lab. On a moving rider, three things work against it:

• Your jaw and cheeks move all the time, the same motion that measurably lowers fit factor.
• Wind pressure at speed pushes and lifts the edges.
• Sweat and fogging make you adjust it mid-ride.

Each leak lets unfiltered air go around the filter. A 99% filter with a leaking edge only cleans the share of your breath that still goes through it.

A full-face helmet and a mask fight for the same space

Both need the same few centimetres around your chin and cheeks. The chin bar sits where the mask's lower edge has to press, and the cheek pads push the mask sideways.

Add a rigid filter cup and either the helmet won't close or the mask gets shoved out of its seal. Even helmet-compatible masks add bulk and heat.

The helmet itself doesn't help. The visor isn't a filter, and the vents feed you raw traffic air. More on that in why your helmet isn't filtering the air you breathe and our helmet air filtration guide.

Active helmet filtration removes the seal problem

An active helmet air purifier works the other way round. It's a small fan-driven unit that clips to the helmet and pushes HEPA-filtered air into your breathing zone.

You don't have to suck air through a sealed mask, so nothing presses on your face or competes with the chin bar.

Easi Breezi is built around this idea. It uses an H11 HEPA filter that stops 95% of PM2.5, a grade that the EN 1822 standard rates to at least 95% efficiency at the most penetrating particle size.

To be fair, a dedicated mask can claim a higher raw number than H11. That number only holds if the seal holds. An active unit trades a slightly lower headline figure for air that reaches you however your face moves.

For the habits that stack on top of good gear, see how to reduce your pollution exposure on a motorcycle and our guide to motorcycle rider respiratory health.

A daily N95 habit costs the most over five years

A mask is cheap to buy and expensive to keep buying. An active unit is the other way round. These assumptions are conservative, so swap in your own:

• You ride six days a week, about 312 ride days a year.
• You use one mask per ride: about 50 US cents for a certified N95, about 8 cents for a surgical mask.
• A half-face respirator means the facepiece plus two pairs of P100 cartridges a year.

One mask per ride isn't harsh. CDC guidance is to throw a respirator away once it's damp, creased, bent or hard to breathe through. A helmet and a tropical commute manage all four in a day.

A daily N95 habit comes to about 780 US dollars over five years and never stops. An active unit costs more up front, then only needs filters, so against daily N95s the gap grows every month.

On cash alone, a surgical mask or a half-face respirator is cheaper over five years. That matters less than it looks.

A surgical mask gives you 42 to 88% filtration from damp fabric that gaps at the cheeks at 50 km/h. A half-face respirator gives excellent P100 filtration in a device you can't wear under a full-face helmet. Cheap protection you can't use isn't cheap.

Disposable masks leave kilos of plastic behind

Single-use masks are layers of melt-blown polypropylene, a plastic. Published figures put a surgical mask at about 4.5 g and an N95 at about 11 g.

Here's what one per ride, six days a week, for five years adds up to:

That's six times fewer items with an active unit and a weekly filter change, because only the filter is replaced. We list a count, not a weight, because we haven't published a per-filter mass yet.

Six questions to ask before you buy

• Does it fit under my helmet without fighting the chin bar or the visor?
• Does it depend on a face seal? If yes, expect leaks once you move, sweat or hit wind.
• What does it filter on the road, not on a still face in a lab?
• Can I breathe easily when working hard? CO₂ rebreathing is a safety issue in traffic.
• What does it cost per month, not only up front?
• Will I keep up with the maintenance? The best filter is the one you replace on schedule.

Masks win on raw filter percentage. Active helmet filtration wins on getting that air to your lungs while you ride.

Frequently asked questions

What is the best anti-pollution mask for motorcycle riders?

R-PUR, Airinum and Respro are the strongest, with tested filtration from 95% up to 99.99% against PM2.5. All of them depend on a face seal that loosens in motion, which an active helmet purifier avoids.

Can I wear an N95 or FFP2 under a motorcycle helmet?

You can, and an N95 is certified to filter at least 95% at 0.3 µm. But the helmet pushes it out of its seal, and head and jaw movement lower its fit factor. Use it for short rides, not as a daily fix.

Does a motorcycle helmet filter the air I breathe?

No. The visor isn't a filter and the vents feed you raw traffic air, so filtration has to be added.

How much pollution do masks actually block when riding?

Field research found that wearing a facemask cut riders' in-transit PM2.5 by 33 to 43%. That's well short of the 95 to 99% on the box, because the seal leaks in motion.

Are anti-pollution masks expensive to maintain?

A little, for as long as you use them. Airinum recommends new filters about every two weeks, and R-PUR filters cost about 30 US dollars each.

What is an active helmet air purifier?

A small fan-driven device that clips to your helmet and pushes HEPA-filtered air to your face, with no seal for riding to break. Easi Breezi uses an H11 HEPA filter that stops 95% of PM2.5.

What to do next

The gear that changes what you breathe is the gear that keeps working when you move.

Written by Ash, mechanical engineer and founder of Easi Breezi, building an active HEPA filtration system for motorcycle helmets (patent pending). Based between Hong Kong and Bali, riding daily in the traffic this blog writes about.