Most years, Singapore gets at least a spell of hazy skies, usually when regional fires and the wind line up during the drier months. The air turns grey, the sun looks orange, and that familiar smoky smell drifts into HDB corridors and offices. Understanding the link between the haze and your health in Singapore helps you stay calm and take sensible steps, rather than either panicking or ignoring it. This is general information, not medical advice, so anyone with ongoing symptoms or a chronic condition should still speak to a doctor.
How the Haze Affects Your Body
Haze is made up of tiny particles small enough to reach deep into your airways. For most healthy people, short exposure causes mild, temporary effects: itchy or watery eyes, a scratchy throat, a runny nose, or a slight cough. You might feel a bit more tired or notice your eyes stinging on the walk to the MRT.
These symptoms usually settle once the air clears. They are your body reacting to an irritant, not a sign of lasting damage for most people. The groups who feel it more strongly are those whose lungs or hearts are already working harder, which is why the advice below focuses on reducing how much smoky air you breathe in the first place.
Reading the PSI and Following NEA
In Singapore, the official guide is the Pollutant Standards Index, or PSI, published by the National Environment Agency. NEA updates readings through the day and issues health advisories that tell each group what is safe. Rather than memorising numbers, get into the habit of checking the current PSI on the NEA website or the myENV app before you plan outdoor activities.
NEA describes air quality in bands from good through to hazardous, and pairs each band with advice for the general population and for more sensitive groups. Because the advisory can change within hours as the wind shifts, always act on the latest reading and NEA guidance rather than yesterday’s, and follow any specific instructions from schools, employers or MOH during a serious episode.
Who Needs to Take Extra Care
Some people should be more cautious even at moderate haze levels. Keep a closer eye on:
- Elderly Singaporeans, whose lungs and hearts may be less resilient
- Babies, toddlers and young children
- Pregnant women
- Anyone with asthma, chronic lung disease, or heart conditions
- People recovering from a recent illness or surgery
The table below is a simple planning aid, not a medical rule. When in doubt, check the live NEA advisory and speak to your doctor about your own situation.
| Group | What to watch for | Sensible action |
|---|---|---|
| Healthy adults | Eye and throat irritation, mild cough | Cut back on strenuous outdoor exercise when the air is poor |
| Elderly and young children | Tiredness, breathlessness, poor appetite | Stay indoors more, keep activity gentle, monitor closely |
| Asthma or lung conditions | Wheezing, tight chest, needing reliever more often | Keep medication handy, follow your action plan, seek care early |
| Heart conditions | Chest discomfort, unusual breathlessness | Reduce exertion, do not ignore new symptoms, call a doctor |
Everyday Steps to Reduce Your Exposure
You cannot control the regional fires, but you can control how much smoky air reaches your lungs. Practical habits that fit Singapore life include:
- Check the PSI before outdoor plans and shift runs, football or long walks to clearer days or early mornings when readings are often lower.
- Stay indoors when the air is poor, keeping windows and doors closed to reduce indoor haze.
- Move workouts inside, swapping the park connector for a gym, a mall walk, or home exercises.
- Stay well hydrated, as our heat and humidity add to the strain when the air is bad.
- Rinse your eyes with clean water and take gentle breaks if you feel irritation building.
If you run an air conditioner, keep it on recirculate rather than drawing in outside air, and clean or replace filters as recommended. A portable air purifier with a suitable filter can help in a bedroom or small room, though it is not essential for everyone.
Masks, Air Quality and Your Home
During heavier haze, NEA and MOH may advise using an N95 mask for people who need to be outdoors for a prolonged period, especially vulnerable groups. A properly fitted N95 filters fine particles far better than a loose surgical or cloth mask, but it only works if it seals against your face, which is why it does not suit small children or people with breathing difficulty who find it hard to wear. Follow the current official guidance on when masks are recommended.
At home, small steps make your space more comfortable: keep one room as a cleaner retreat, avoid adding indoor smoke from cooking on high heat without ventilation, and wipe down dusty surfaces. If you use a purifier, size it to the room and keep doors closed for it to work well.
When to See a Doctor
Most haze symptoms are mild and pass. See a GP or polyclinic if you have a cough, breathlessness, chest discomfort or eye problems that are severe, persistent, or getting worse, or if a child or elderly family member seems unusually unwell, drowsy or is eating and drinking poorly. People with asthma or heart or lung conditions should seek care early rather than waiting.
Treat some signs as urgent. If you or someone else has severe breathing difficulty, chest pain, blue lips, confusion or collapse, call 995 or go to the nearest A&E straight away. When you are unsure how serious something is, it is always reasonable to get checked.
The haze can feel unsettling, but a few steady habits, checking NEA, cutting outdoor exposure, protecting the vulnerable, and knowing your red flags, keep you and your family well through the hazy weeks.
Explore more
Good everyday health helps you cope better when the air turns bad, so it is worth building strong basics year round. See our guide to staying hydrated in Singapore’s heat and, since the haze often arrives in hot, dry spells, learn about recognising heat exhaustion and heat stroke. To support your defences generally, read our take on boosting your immunity naturally.