Pull up two air quality readings for Jakarta this week and you get two different verdicts on the same city, taken minutes apart. Indonesia's own monitoring network reads the Kemayoran station in central Jakarta at PM2.5 36.9 µg/m³, filed as "Sedang" — Moderate — on the national ISPU scale (BMKG, 2026). Open the app most riders actually check and it says something else: IQAir's independent Jakarta reading shows US AQI 160, PM2.5 68.9 µg/m³, filed as "Unhealthy" (IQAir, 2026). Same city, same window, two different verdicts — and neither number describes what's actually reaching your face at handlebar height in traffic.
Part of our Haze and air quality by city guide.
Key takeaways
- Indonesia's official BMKG station in central Jakarta read PM2.5 36.9 µg/m³ this week, filed as "Sedang" (Moderate) on the national ISPU scale (BMKG, 2026).
- At close to the same time, the independent tracker IQAir read the same city at US AQI 160, PM2.5 68.9 µg/m³, filed as "Unhealthy" (IQAir, 2026).
- Indonesia's Ministry of Health has logged 174,694 acute respiratory infection cases in fire- and haze-affected regions since August 1, more than 40,000 of them in children five and under (Malay Mail / Kemenkes, 2026).
- Peer-reviewed field studies from Hanoi to Bengaluru consistently find a motorcyclist's actual on-road exposure running well above whatever the nearest ambient station reports (Quang et al., 2020; Upadhya et al., 2024).
The research behind this
Peer-reviewed measurements this post is built on. Each card says what was measured, what was found, and what it cannot tell you.
Hanoi motorcyclist black carbon
- What they measured
- Simultaneous black carbon with portable microAeth AE51 aethalometers, worn on motorcycles and carried inside buses and cars, in real Hanoi traffic.
- What they found
- Mean black carbon 29.4 µg/m³ on motorcycles vs 10.1 µg/m³ in buses; the gap widened to 34.7 vs 12.1 µg/m³ in peak traffic.
- What it can't tell you
- Pilot-scale study, small sample. Black carbon is in no public air-quality index anywhere, so this exposure never shows up on any official number.
Delhi auto-rickshaw ultrafines
- What they measured
- About 180 hours of real-time PM2.5, black carbon and particle-number counts inside open auto-rickshaws in New Delhi, compared against a simultaneous ambient monitor.
- What they found
- In-vehicle PM2.5 ran 1.5 times the ambient reading; black carbon 3.6 times ambient; particle count 8.4 times ambient (190 µg/m³ PM2.5 in-vehicle).
- What it can't tell you
- An open three-wheeler isn't an exact stand-in for a motorcycle, but it's the closest reference-grade proxy for open-air, on-road two-wheeler exposure.
Bangkok motorcycle-taxi drivers vs the station reading
- What they measured
- 441 motorcycle-taxi drivers across six central Thai provinces; 153 personal PM2.5 samples via SKC PCXR8 pumps, roughly 6.5 hours a day, January to March 2023.
- What they found
- Personal PM2.5 ranged 132.2 µg/m³ (Bangkok) to 410.9 µg/m³ (Pathum Thani) — statistically unrelated to the official PCD monitoring-station reading (p > 0.05).
- What it can't tell you
- Dry-season Thailand, not Indonesia's haze season — but it's direct peer-reviewed evidence that a rider's real exposure and the city's official station number don't have to move together at all.
Bengaluru: what a fixed network misses between roads
- What they measured
- About a year of mobile monitoring of black carbon, ultrafine particles and CO2 across 150 unique kilometres of Bengaluru road, roughly 22 repeat passes per segment, mapped at 30-metre resolution.
- What they found
- Mean black carbon ran about 10 µg/m³ on residential streets, 22 on arterial roads, and 56 on highways — a spread a rider crosses in minutes, invisible to any single fixed station.
- What it can't tell you
- India, not Southeast Asia's haze conditions specifically — but it's the clearest evidence that one city-level number can't represent what any given street actually delivers.
What the Studies Actually Measured
None of the four studies above were run in Jakarta or during a haze event — which is why they matter here. They establish a pattern that holds regardless of city or week: whatever a fixed ambient station reports, a rider's actual exposure runs higher, and the biggest gaps are usually in pollutants no index tracks at all.
In Hanoi, researchers strapped portable aethalometers to real commuters and found motorcyclists breathing close to three times the black carbon of bus passengers on the same streets (Quang et al., 2020). In Delhi, a Berkeley team wired auto-rickshaws with reference-grade instruments and found ultrafine particle counts running 8.4 times the simultaneous ambient reading (Apte et al., 2011). In Thailand, 441 motorcycle-taxi drivers wore personal PM2.5 pumps for three months, and their exposure had no statistical relationship to the government's own station reading (Samana et al., 2025). And in Bengaluru, a year of mobile monitoring mapped a five-to-six-times spread in black carbon between a residential street and a highway on-ramp minutes away — resolution no fixed network in the region matches (Upadhya et al., 2024).
The World Health Organization's own 2021 guidelines admit the gap is structural, not just a monitoring-budget problem: there is still no formal guideline value for black carbon or ultrafine particles at all, only qualitative "good practice" statements, because the evidence base isn't there yet to set a number (WHO, 2021). If there's no guideline, there's no index line item — so the pollutants doing the most damage to a rider are the ones no official reading, anywhere, is built to show.
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The Official Number: Jakarta's BMKG Reads "Moderate"
Indonesia's Agency for Meteorology, Climatology and Geophysics (BMKG) runs the country's official PM2.5 network. This week its Kemayoran station, in central Jakarta, reported PM2.5 at 36.9 µg/m³ (BMKG, 2026). Under Indonesia's ISPU breakpoints, that value sits inside the "Sedang" (Moderate) band, which runs from 15.5 to 55.4 µg/m³ (KLHK/PermenLHK 14/2020). That's not a small band, and it's not a wrong reading — it's an accurate report of what one fixed instrument, on one rooftop, in one part of a city of roughly 10 million people, measured at that hour.
The Independent Number: IQAir Reads "Unhealthy"
At close to the same hour, IQAir's independently aggregated Jakarta reading showed US AQI 160, PM2.5 68.9 µg/m³, filed as "Unhealthy" (IQAir, 2026). That's nearly double the BMKG station's PM2.5 figure, and it lands in a completely different severity category. IQAir blends reference-grade government feeds with a wider mesh of lower-cost sensors — not government-audited, but it's the number that actually shows up on the screen of a rider checking their phone before a commute.
Same city, two verdicts
Toggle between the official and independent reading for Jakarta, taken within the same window this week.
36.9 µg/m³ — "Sedang" (Moderate)
BMKG Kemayoran station, central Jakarta. ISPU "Sedang" band: 15.5–55.4 µg/m³. Source: bmkg.go.id, read 2026-09-22.
68.9 µg/m³ — US AQI 160, "Unhealthy"
IQAir Jakarta, blended government + sensor feed, US EPA scale. Source: iqair.com, read 2026-09-23.
| Source | PM2.5 | Category |
|---|---|---|
| BMKG Kemayoran (official) | 36.9 µg/m³ | Sedang (Moderate) |
| IQAir Jakarta (independent) | 68.9 µg/m³ | Unhealthy (US AQI 160) |
Why the Two Numbers Disagree
Neither reading is fabricated and neither agency is lying — they're built on different scales, measuring different things, at different points in a large, unevenly polluted city. Indonesia's ISPU and the US EPA's AQI use different breakpoints for the same pollutant: under the 2024-revised US scale, 68.9 µg/m³ of PM2.5 sits well past the "Moderate" cutoff of 35.4 µg/m³ (IQAir, 2024) and into "Unhealthy" territory, while Indonesia's wider "Sedang" band, running to 55.4 µg/m³ (KLHK/PermenLHK 14/2020), has more room in it. A single Kemayoran rooftop reading also represents one location in a metro area of roughly 10 million people, not the traffic corridor a rider is actually sitting in. Neither problem is unique to Jakarta or to this week — Indonesia's own index has shown it can register genuine emergencies too: Central Kalimantan's ISPU hit 1,919 on September 2, 2026, categorized as an immediate threat to human health, anything over 300 being "hazardous" (TIME, 2026). The index isn't broken — it's built to summarize a city, not to describe your commute.
Every Few Years, Indonesia Burns — and the Case Count Keeps Climbing
This isn't a one-off week. Indonesia's three worst haze years on record — 1997–98, 2015, and 2026 — are all strong El Niño years. The 1997–98 crisis cost the region more than $9 billion in economic, social and environmental losses; the 2015 crisis burned roughly 2.6 million hectares between June and October and cost Indonesia at least $16 billion (TIME, 2026). This year, fires burned 202,000 hectares from January to July, then a further 600,000 hectares in August alone, in what TIME reports scientists are calling Indonesia's worst wildfire season in 11 years, driven by a "Super El Niño" (TIME, 2026). The human cost is climbing with it: 113,336 respiratory infection cases were logged in a single day, September 9, across seven affected provinces (TIME, 2026); by September 21 the national total for the haze period had reached 174,694, with more than 40,000 of those cases in children aged five and under (Malay Mail / Kemenkes, 2026).
If This Is the New Normal: What a Rider's Next Five Years Might Look Like
Here's a pattern-based projection, not a modelled forecast: Indonesia's three worst haze years all line up with strong El Niño events roughly once a decade, and scientists already expect 2027 to challenge 2026 for the hottest year on record (TIME, 2026). If that cadence holds, a rider commuting daily in Jakarta, Palembang or Jambi should expect at least one more multi-week hazardous-category haze event before 2031 — stacked on the ordinary dry-season exposure the studies above already show running above ambient on a normal day. Monitoring will likely improve; whether it closes the black-carbon-and-ultrafines gap the WHO itself flags as unresolved is a separate, open question (WHO, 2021).
What This Means at Handlebar Height
A vented full-face helmet was never built to read an index — it just lets air in. Passive vents move air using forward motion and pressure differential, with no filtration medium in the path, so whatever concentration is outside is what reaches the rider's face, whichever number the app happens to show that morning. PM2.5 particles are roughly a thirtieth the width of a human hair (EPA figure, cited in TIME, 2026) and pass straight through mesh designed to stop insects and rain, not particulates. And a rider isn't reading either number from a rooftop three metres up — they're at exhaust height, in the traffic stream, which is exactly where the on-road and personal-exposure studies above keep finding readings running above the ambient number, not below it. At a stopped light in haze, a rider sits in the same stagnant air pocket the smoke isn't clearing from — the opposite of the moving-air assumption passive vent design depends on.
Who Can You Trust? Independent Sources Riders Can Check Themselves
No single number, official or independent, describes a specific street on a specific morning. These are worth checking together, not instead of each other:
- IQAir / AirVisual — free, global, US EPA scale, so it reads "worse" than a local PSI/API/ISPU on identical air.
- Nafas — free, Indonesia-specific, calibrated sensors, monthly city reports.
- OpenAQ — free, open API of government reference data, only as reliable as the feed behind it.
- CREA (Centre for Research on Energy and Clean Air) — free NGO trackers and annual reviews for the region.
- Official BMKG feeds — read the raw PM2.5 number, not just the category label; the band can hide where a value sits.
- The EB live haze page — model-estimate fusion for 103 cities, a fast second opinion before a ride, never a substitute for an official reading: easibreezi.com/pages/haze.
Frequently Asked Questions
Do motorcycle helmets have air filters?
Most standard motorcycle helmets don't — they rely on passive vents that move outside air straight through to the rider's face without filtering it. Active filtration is an add-on system, not a standard helmet feature.
Do motorcycle helmets have ventilation?
Yes, almost all full-face and modular helmets include vents designed to move air for cooling and defogging. Those vents are built to control airflow and moisture, not to filter particulates out of the air passing through them.
Why do air quality apps show different numbers for the same city?
Different apps and agencies use different scales (Indonesia's ISPU, the US EPA's AQI, Singapore's PSI and others), different breakpoints for the same pollutant, and different station networks — so the same physical air can land in different severity categories depending on which system is reading it.
Is Jakarta's air actually dangerous right now?
Both readings referenced in this post — BMKG's 36.9 µg/m³ and IQAir's 68.9 µg/m³ — sit above the WHO's annual PM2.5 guideline of 5 µg/m³ (WHO, 2021), and Indonesia's Ministry of Health has logged 174,694 haze-related respiratory cases this season (Malay Mail / Kemenkes, 2026). Whichever category label you use, the underlying trend is real.
Which air quality reading should I trust before I ride?
Check more than one source rather than relying on a single number — an official station, an independent tracker like IQAir, and if you're in Indonesia, Nafas. None of them measures what's happening at your specific location, so treat any single reading as a starting point, not a verdict.
Filter at the Only Point That Matters: Where You're Actually Breathing
The honest answer to "which number should I trust" is that neither one describes your commute — so the fix isn't picking the right index, it's not needing one. Easi Breezi mounts active H11 HEPA filtration (≥95% PM2.5 capture) directly at the helmet, drawing and filtering air right at the point a rider breathes it, patent pending. The EB Unit ships at $199 with flat $15 worldwide shipping, duties included. Check today's reading for your own city on the live haze page, then see the system that makes the number irrelevant: easibreezi.com/products/eb.
Sources
- Quang, T.N., Hue, N.T., Dat, M.V., Tran, L.K., Phi, T.H., Morawska, L., Thai, P.K. (2020). "Motorcyclists have much higher exposure to black carbon compared to other commuters in traffic of Hanoi, Vietnam." Atmospheric Environment. doi.org/10.1016/j.atmosenv.2020.118029
- Apte, J.S., Kirchstetter, T.W., Reich, A.H., Deshpande, S.J., Kaushik, G., Chel, A., Marshall, J.D., Nazaroff, W.W. (2011). "Concentrations of fine, ultrafine, and black carbon particles in auto-rickshaws in New Delhi, India." Atmospheric Environment 45(26). doi.org/10.1016/j.atmosenv.2011.05.028
- Samana, Ito, Suthienkul, Ketsakorn (2025). "Analysis of PM-bound polycyclic aromatic hydrocarbons exposure among motorcycle taxi drivers in six central provinces in Thailand in winter." PLOS ONE. doi.org/10.1371/journal.pone.0336587
- Upadhya, A.R., Kushwaha, M., Agrawal, P., Gingrich, J.D., Asundi, J., Sreekanth, V., Marshall, J.D., Apte, J.S. (2024). "Multi-season mobile monitoring campaign of on-road air pollution in Bengaluru, India." Science of the Total Environment. doi.org/10.1016/j.scitotenv.2024.169987
- World Health Organization (2021). WHO Global Air Quality Guidelines. who.int/publications/i/item/9789240034228
- BMKG (Indonesia's Agency for Meteorology, Climatology and Geophysics). PM2.5 station network, Kemayoran, Jakarta, read 2026-09-22. bmkg.go.id/kualitas-udara/pm25
- IQAir / AirVisual. Jakarta live air quality, read 2026-09-23. iqair.com/air-quality/indonesia/jakarta/jakarta
- Malay Mail, via Indonesia's Ministry of Health (2026-09-22). "Respiratory problems climb past 170,000 cases in haze-hit Indonesia." malaymail.com
- TIME (2026-09-17). "Why Southeast Asia Is Facing a Haze Crisis." time.com
- Indonesia's Ministry of Environment and Forestry (KLHK), via PPMU. ISPU breakpoints under PermenLHK No. 14/2020. ppmu.kemenlh.go.id
- IQAir (2024). "IQAir implements 2024 update to U.S. EPA Air Quality Index (AQI)." iqair.com
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.