On June 24, 2026, the Singapore Institute of International Affairs issued a rare Red Alert, only the second in seven years. It warns that Southeast Asia faces its worst transboundary haze risk since 2023. It named August and September as the peak window, and by October 2026 the haze had arrived across the region. For the latest readings and sources, see our dated update, When will the haze be gone?
Part of our Haze and air quality by city guide.
Your full-face helmet is not protecting you from any of it. In fact, during slow traffic, exactly when pollution is at its worst, the way most helmets are designed makes your exposure worse, not better.
How Jakarta's air got 63% more toxic in five years
This isn't a new problem that appeared overnight. It's a trend that has been compounding for years while the motorcycle industry kept selling the same ventilation design.
The Centre for Research on Energy and Clean Air (CREA) tracked Jakarta's annual average PM2.5 concentrations from 2019 to 2024:
- 2019: 30 µg/m³
- 2021: 45 µg/m³ (post-lockdown rebound)
- 2024: 49 µg/m³
That's a 63% increase in five years on the annual average, and the annual average is the quiet number. The dry-season peaks are far worse.
In June 2026, as the El Niño-driven dry season compressed Jakarta's atmosphere, PM2.5 levels reached 61 µg/m³. That is more than 12 times the WHO annual guideline of 5 µg/m³. The Jakarta Post reported residents suffering respiratory problems at rates the city hasn't seen outside an extreme haze event.
Indonesia ranked as the worst country in Southeast Asia for air quality in IQAir's 2024 World Air Quality Report, and 15th worst globally. Jakarta's metro areas break the WHO PM2.5 limit by up to ten times on an annual basis, not only during spikes.
In 2025, only 11% of monitored days in Jakarta fell within WHO guidelines (IQAir).
And this isn't only a Jakarta story. The State of Global Air 2025 report found that the entire population of Southeast Asia breathed PM2.5 at 4.2 times the WHO guideline in 2023. The SIIA's 2026 Haze Outlook now confirms that August and September will bring the region its most concentrated pollution episode in three years.
Motorcycle commuters make up a significant share of daily traffic in every major SE Asian city. For them, this is the air inside the helmet every single morning.
Why your full-face helmet can't protect you from PM2.5
The helmet industry has never engineered helmets to filter the air you breathe. Helmets are designed for impact absorption. Ventilation, which is what the vents on a full-face helmet provide, is not the same as filtration.
Here is the specific physics of why passive helmet vents fail for PM2.5:
1. Passive vents require forward motion to function.
The pressure differential that draws air through a helmet's vent channels only exists when you're moving. In slow Jakarta or Bangkok traffic, riders spend 40 to 60% of their commute at low speed or stationary. Then there is no airflow through the vent system. The vents are effectively closed, and you're breathing recirculated air inside a sealed shell.
How much of your ride has zero vent airflow?
Passive vents only work when air is forced through them by forward motion. Toggle between riding at speed and the slow, stop-start traffic that fills 40 to 60% of a typical SE Asia commute.
2. PM2.5 particles are 80 to 200× smaller than the mesh openings.
Helmet vents include mesh inserts to block insects and road debris. These mesh openings are typically 200 to 500 microns wide. PM2.5 particles, the class of fine particulate matter most associated with cardiovascular and respiratory disease, are 2.5 microns or smaller. They pass straight through the mesh with zero resistance.
3. At idle in traffic, you're sitting in a concentrated pollution pocket.
Exhaust from surrounding vehicles rises into the rider's breathing zone. Picture yourself stationary at lights in central Jakarta, with PM2.5 at 61 µg/m³ in the ambient air. The exhaust micro-environment immediately around your helmet can be significantly higher than the background reading. A full-face helmet at idle channels this directly to your face through the chin opening.
Closing the vents helps marginally, but doesn't seal the helmet. Gaps at the chin bar, visor edge, and neck still admit unfiltered air. A full-face helmet with closed vents offers some reduction in airflow but zero filtration of particles already at breathing size.
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.
What 5 more years of this looks like for SE Asia riders
The 2026 haze crisis is a snapshot of a worsening trend, and two data sets make the trajectory clear.
On air quality: If Jakarta's annual average PM2.5 continues on its 2019 to 2024 growth trajectory (roughly +3.8 µg/m³ per year), annual averages could approach 65 to 75 µg/m³ by 2031. That is 13 to 15 times the WHO annual guideline.
The SIIA has now issued Red Alert haze warnings in both 2023 and 2026, signalling an intensifying haze cycle driven by El Niño frequency. ASEAN's meteorological centre confirms below-normal rainfall across southern ASEAN through August 2026, extending the high-concentration window.
(Note: this is a synthesised projection based on CREA historical data and SIIA haze cycle patterns, not a single published forecast.)
On rider numbers: The Southeast Asian two-wheeler fleet is projected to grow from 39 million units (2022) to 68 million by 2030, a 74% increase. More riders, in worse air, with the same unfiltered helmets.
The cumulative rider exposure burden (the total number of people breathing unfiltered PM2.5 during commutes) could nearly double within this decade.
The fix: active induction instead of passive ventilation
Passive vents fail because they depend on forward motion and don't filter at the right particle size. What works is active induction with real filtration.
The Easi Breezi EB Unit clips onto your own full-face or modular helmet and uses bike-powered active induction to push air through an H11 HEPA filter. The filter is rated to capture at least 95% of the PM2.5 passing through it.
The key difference is that the EB system creates a positive pressure differential inside the helmet, independent of forward motion. At idle in Jakarta traffic, with PM2.5 at 61 µg/m³, the unit is working hardest precisely when a passive vent system is doing nothing.
It doesn't require a new helmet. It clips on in five seconds. It runs off the bike's power, so there's no battery to charge. And the H11 HEPA filter media is supplier-rated at 95.5% or better at the hardest particle size to catch, and measured at 97% in our own bench test (see How we test).
You can build your filtration kit (unit + filter packs) and add HEPA filter packs for extended protection.
The 2026 haze is here. Is your helmet filtering it?
The SIIA's Red Alert isn't a prediction. It warned about the window riders are in now. In June, Jakarta was already at 61 µg/m³, and by October the haze had spread across the region.
If you ride in Southeast Asia, the question isn't whether you'll be exposed to the worst air quality in three years. You will be. The question is whether you're riding with passive mesh that can't stop PM2.5, or with active filtration rated to capture ≥95% of it.
Frequently asked questions
Does a full-face motorcycle helmet protect against air pollution?
No. Full-face helmets are designed for impact protection, not air filtration. Their vent mesh openings (200 to 500 microns) are far too large to stop PM2.5 particles (≤2.5 microns).
When stationary in traffic, the highest-pollution scenario, passive vents provide no airflow at all. Only active filtration with a rated HEPA filter media can intercept PM2.5.
What is PM2.5 and why is it dangerous for motorcycle riders?
PM2.5 refers to fine particulate matter with a diameter of 2.5 microns or less. At this size, particles bypass the respiratory system's natural defences and enter the bloodstream, where they are associated with cardiovascular disease, reduced lung function, and premature death.
Motorcycle riders in Southeast Asian cities face some of the highest PM2.5 exposures globally. Jakarta's dry-season peaks are currently 12× the WHO annual guideline.
What is the SIIA Haze Outlook 2026 and what does it mean for riders?
The Singapore Institute of International Affairs (SIIA) publishes an annual Haze Outlook for Southeast Asia. In June 2026, it issued a rare Red Alert, only the second in the report's seven-year history. It warns that August and September 2026 carry the highest risk of severe transboundary haze since 2023.
For riders in Indonesia, Malaysia, Singapore, and Brunei, this means peak PM2.5 concentrations during the heaviest commute months of the second half of the year.
Is it enough to close my helmet vents during high-pollution days?
Partially, but not adequately. Closing vents reduces airflow but does not seal the helmet. Gaps at the chin opening, visor edges, and neck still admit unfiltered ambient air.
More importantly, PM2.5 particles are small enough to pass through any unsealed gap. You would need a fully sealed, positively pressurised system with certified HEPA filtration to meaningfully reduce exposure.
Written by Ash, mechanical engineer and founder of Easi Breezi (patent pending), riding daily in the traffic this blog writes about.