Pekanbaru's PM2.5 reached 285.8 µg/m³ at 7pm WIB on 16 October 2026, in the hazardous category on the BMKG monitor (RiauAktual, 2026). That is about 19 times the WHO 24-hour guideline of 15 (WHO, 2021). If your ride can wait, wait. If it cannot, fit a sealed N95 or KN95 before you leave.
The reading was not a one-off spike. It climbed through the day, from about 180 at 11am to about 228 at 6pm, then to 285.8 an hour later (RiauAktual, 2026). A rider heading home in the evening rode into the worst of it.
Key takeaways
- Pekanbaru's PM2.5 hit 285.8 µg/m³ at 7pm WIB on 16 October 2026, after about 180 at 11am and about 228 at 6pm (RiauAktual, 2026).
- An earlier hazardous reading this month was 298.7 µg/m³ at 6am on 6 October, a day after 88.5 at 8am on 5 October (RiauAktual, 2026).
- In Central Kalimantan homes, indoor PM2.5 matched outdoor PM2.5 (median ratio 1.01), so staying in is a weak shield (Graham et al., 2024).
- Modelling suggests a sealed N95 cuts exposure more than 14 times, against 1.7 times for a surgical mask (Kodros et al., 2021).
What the readings and studies actually measured
The numbers come from the BMKG air quality monitor in Pekanbaru, reported by the local outlet RiauAktual. They are hourly PM2.5 concentrations, not a 24-hour index. On 6 October the monitor ran between 212.5 and 298.7 from midnight to 6am (RiauAktual, 2026).
An hourly spike is not a daily average, so the WHO comparison needs care. The WHO guideline of 15 µg/m³ is for a full 24 hours (WHO, 2021). Read 19 times as the size of the spike, not as a daily dose.
Why staying inside does not fix it here
Median ratio of indoor to outdoor PM2.5 in rural Central Kalimantan homes during fire smoke. A ratio of 1 means no protection at all.
Source: Graham et al., GeoHealth, 2024Graham and colleagues put sensors inside and outside homes in the other big Indonesian peat region. Smoke came straight in. The authors note this is higher than in wildfire studies from the USA, so the housing offers little protection (Graham et al., 2024).
That matters for riders because the ride is only part of the exposure. Pekanbaru schools moved to remote learning on 6 and 7 October after an official air index reading of very unhealthy (RiauAktual, 2026). Learning at home keeps children off the road, but it will not clear the air in the house.
The wider picture is large. A model of the 2015 fires put 69 million people in unhealthy air and estimated 11,880 excess deaths (Crippa et al., 2016). A review across the region puts the burden near 100,000 deaths, with the caveat that the risk functions come from other regions (Phung et al., 2022).
Check the hourly PM2.5 before you leave and again before the ride home. On 16 October the evening was worse than the morning.
Ride with filtered air
Filters haze PM2.5 on every ride
Easi Breezi clips onto any helmet and feeds you H11 HEPA-filtered air. Bike-powered, no batteries, no charging.
Why a rider breathes more than the monitor says
A fixed monitor sits above the road. A rider sits in open air, in the exhaust of the vehicle ahead. In Makassar, motorcycle riders breathed 4 times the PM2.5 of car riders on the same trips (Patel et al., 2016).
That study was not in a haze week, so the gap today is probably wider, but nobody has measured it in Pekanbaru. Treat 285.8 as a fixed-point reading. What a rider breathes on a busy road is probably higher.
Which mask actually helps
Fabric and cloth masks are the weak link. In lab tests, common fabrics let through 40% to 90% of test particles, against far less for N95 filter material (Rengasamy et al., 2010).
The Kodros model puts numbers on it. A well-sealed N95 cut exposure by more than 14 times at a 5% leak rate, surgical masks by 1.7 times and natural-fibre masks by 1.9 times (Kodros et al., 2021).
The catch is the seal. A beard, a helmet strap or a loose nose clip can end the benefit. In Makassar, only surgical masks lowered exposure consistently on motorcycles (Patel et al., 2016).
What to do on your ride today
- Delay or shorten the ride. Each minute at 285.8 is dose you can avoid, and the evening looked worse than the morning on 16 October (RiauAktual, 2026).
- Wear a fitted N95 or KN95 and press it to your face every time. The 14 times figure assumes a 5% leak (Kodros et al., 2021).
- Skip cloth and scarf masks. They let through 40% to 90% of fine test particles (Rengasamy et al., 2010).
- Do not count on the house. Indoor smoke matched outdoor smoke in Central Kalimantan homes (Graham et al., 2024).
- For filtered air that does not depend on a face seal, look at an active HEPA helmet system.
For the wider picture, see when the haze will be gone and the live haze map for riders.
Frequently asked questions
What is the air quality in Pekanbaru today?
At 7pm WIB on 16 October 2026 the BMKG monitor read 285.8 µg/m³ of PM2.5, in its hazardous category (RiauAktual, 2026). Check the BMKG air quality page for the current hour.
Is the Pekanbaru haze getting worse?
It comes in waves. On 6 October the monitor hit 298.7, and on 16 October it reached 285.8 after a steady climb through the day (RiauAktual, 2026; RiauAktual, 2026).
Does a normal face mask work against haze?
Fabric masks do little against fine particles in lab tests (Rengasamy et al., 2010). A sealed N95 or KN95 performs far better in modelling, but only if it fits (Kodros et al., 2021).
The research behind this: 6 studies
Peer reviewed work this post is built on. Each card says what was measured, what was found, and what it cannot tell you.
Smoke sensors in Central Kalimantan
- What they measured
- 13 low-cost PM2.5 sensors across urban and rural sites, indoors and outdoors, through the start of the 2023 El Niño dry season (1 September to 31 October).
- What they found
- Mean outdoor PM2.5 was 136 µg/m³, with fires adding 90. The median indoor to outdoor ratio was 1.01 in rural homes, so the housing gave almost no shelter.
- What it can't tell you
- Central Kalimantan in 2023, not Riau in 2026, and the sensors are low-cost units corrected against a model.
The 2015 fires in Equatorial Asia
- What they measured
- A high-resolution chemistry and weather model of the autumn 2015 fires, checked against satellite and ground observations.
- What they found
- Fire smoke kept 69 million people in unhealthy air, and short-term exposure may have caused 11,880 excess deaths (range 6,153 to 17,270).
- What it can't tell you
- A model estimate for 2015. It says nothing about any single day this week.
How much a mask actually cuts exposure
- What they measured
- A modelling framework for masks and respirators that accounts for filter efficiency, fit and particle size.
- What they found
- An N95 with a 5% leak rate cut exposure by more than 14 times. Surgical masks cut it 1.7 times and natural-fibre masks 1.9 times.
- What it can't tell you
- A model, not a field trial. The N95 result depends on a good seal that real riders often lose.
Cloth masks against fine particles
- What they measured
- Five kinds of fabric (sweatshirts, T-shirts, towels, scarves, cloth masks) tested against 20 to 1,000 nanometre particles and compared with N95 filter material.
- What they found
- The fabrics let through 40% to 90% of test particles in one standard test, far more than N95 media.
- What it can't tell you
- Lab filter material on a test rig, with no face seal, so it is a best case for the fabric.
Health effects of Southeast Asian smoke haze
- What they measured
- A scoping review of studies of vegetation and peatland fire haze across Southeast Asia.
- What they found
- Studies reported excess deaths and illness in haze periods. Burden estimates reach about 100,000 deaths across the region.
- What it can't tell you
- A review of mixed methods. The estimates borrow risk figures from studies in other regions.
Motorcycle against car exposure
- What they measured
- Handheld particle counters on motorcycle, minibus and car trips in Makassar, Indonesia, plus tests of surgical masks, bandanas and motorcycle masks.
- What they found
- Against cars, average motorcycle exposure was 4 times higher for PM2.5 and 13 times higher for PM10. Only surgical masks lowered it consistently.
- What it can't tell you
- A non-haze baseline, so the gap in a haze week is probably larger, but that was not measured.
Sources
- RiauAktual (2026). Udara Pekanbaru Masuk Level Berbahaya, PM2.5 Tembus 285,8 µg/m³. Published 16 October 2026, citing the BMKG air quality monitor.
- RiauAktual (2026). Kabut Asap Makin Pekat, Udara Pekanbaru Tembus Level Berbahaya. Published 6 October 2026.
- World Health Organization (2021). WHO global air quality guidelines.
- Graham, A. M. et al. (2024). Updated smoke exposure estimate for Indonesian peatland fires using a network of low-cost PM2.5 sensors and a regional air quality model. GeoHealth.
- Crippa, P. et al. (2016). Population exposure to hazardous air quality due to the 2015 fires in Equatorial Asia. Scientific Reports.
- Kodros, J. K. et al. (2021). Quantifying the health benefits of face masks and respirators to mitigate exposure to severe air pollution. GeoHealth.
- Rengasamy, S., Eimer, B., Shaffer, R. E. (2010). Simple respiratory protection: evaluation of the filtration performance of cloth masks and common fabric materials against 20 to 1000 nm size particles. Annals of Occupational Hygiene.
- Phung, V. L. H. et al. (2022). A scoping review on the health effects of smoke haze from vegetation and peatland fires in Southeast Asia. PLOS ONE.
- Patel, D., Shibata, T., Wilson, J., Maidin, A. (2016). Challenges in evaluating PM concentration levels, commuting exposure, and mask efficacy in reducing PM exposure in growing, urban communities in a developing country. Science of the Total Environment.
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.