Singapore Haze September 2026: What Cyclists Need to Know About PM2.5

Updated: 5 September 2026

TL;DR � Singapore haze, PM2.5 and cycling

Singapore haze September 2026: Parts of Singapore reached the Unhealthy PSI range on 4 September.
PM2.5 and cycling: Exercise increases breathing rate, so strenuous cycling can increase the amount of polluted air you inhale.
PSI vs PM2.5: Check the 1-hour PM2.5 reading before riding and the 24-hour PSI forecast when planning ahead.
Cycling during haze: When PSI is Unhealthy, NEA advises reducing prolonged or strenuous outdoor exercise.
Mask for PM2.5: A properly fitted particulate respirator can reduce exposure, but it does not make strenuous exercise in unhealthy air automatically safe.
Mask fit matters: A good facial seal is important because polluted air can bypass the filter through gaps.
Cycling mask: Look for particulate filtration, good fit, low breathing resistance, stability and comfort.

What is happening with Singapore’s haze?

On 4 September 2026, Singapore’s 24-hour PSI reached 101 in the Central region, entering the Unhealthy range for the first time since October 2023. By 9pm, Central reached 120 and the Eastern region also entered the Unhealthy range.

NEA reported smoke plumes from fires in southern and central Sumatra and parts of Kalimantan moving towards Singapore.

Conditions can vary between regions, so cyclists should check their own area’s air-quality readings.

For the latest information, check NEA, the Singapore haze microsite, or the myENV app.

Why does haze matter more when cycling?

cycling in haze air Singapore — Screenshot

PM2.5 is fine particulate matter 2.5 micrometres or smaller. During transboundary haze, it is the main pollutant of concern.

Cycling increases your breathing rate, particularly when climbing or riding hard. You therefore inhale more air than when sitting quietly, potentially increasing your exposure to airborne particles.

When the 24-hour PSI reaches the Unhealthy range, NEA advises healthy people to reduce prolonged or strenuous outdoor physical exertion.

If conditions deteriorate, consider riding for a shorter time, reducing intensity, choosing a less exposed route, postponing the ride or exercising indoors.

Should cyclists check PSI or PM2.5?

Both are useful, but for different purposes:

1-hour PM2.5: Check this before deciding whether to ride now.

24-hour PSI: Use this when planning activities ahead.

PM2.5 can change during the day with wind and weather, so yesterday’s PSI is not a good indication of today’s exposure.

Can a mask reduce PM2.5 exposure?

A properly fitted particulate respirator can reduce the amount of airborne particulate matter you breathe.

But a mask is not a reason to ignore air-quality advice. Reducing exposure remains the first step.

If you need to cycle outdoors, the fit of the respirator is particularly important. A high-efficiency filter cannot provide its intended protection if air leaks around the edges.

When cycling, movement, sweat and heavier breathing can make a poor fit more noticeable.

Learn more: How to Make Sure Your Mask Fits and Make a Good Seal on Your Face

What should cyclists look for in a respirator?

For cycling during haze, consider:

Particulate filtration suitable for fine particles such as PM2.5.
A good facial seal around the nose, cheeks and chin.
Low breathing resistance, particularly if cycling involves physical effort.
Stability during movement so the mask stays in position.
Comfort for the duration of the ride.

A reusable respirator can also be practical for cyclists who regularly encounter changing air-quality conditions.

Totobobo is a lightweight reusable respirator that can be reshaped to improve its fit. Learn how to ReShape your Totobobo mask.

If you have to cycle to work

If cycling is your transport, focus on reducing your total exposure:

Check 1-hour PM2.5 before leaving.
Check the 24-hour PSI forecast when planning ahead.
Reduce your riding intensity.
Choose a less polluted route where practical.
Allow more time so you do not need to ride hard.
Use a properly fitted particulate respirator if appropriate.
Consider alternative transport if conditions become significantly worse.

For more information, see The Best Reusable Respirator Mask for Biking and Cycling in Air Pollution: Is It Bad for You, and Do You Need a Mask?.

The bottom line

During Singapore’s September 2026 haze, check PM2.5 before riding, reduce strenuous exercise when air quality is unhealthy, and reduce your exposure wherever possible.

If you do need additional protection, a properly fitted particulate respirator can be useful. Fit matters as much as the filter rating.

If you feel unwell while riding, stop and move to cleaner air.

This article provides general information about air pollution and cycling. It is not medical advice. During haze episodes, follow the latest health advisories issued by Singapore’s National Environment Agency.