Is It Safe for Children to Attend Swimming Lessons During Haze in Singapore?

By Coach Tan Meng Chew (MC), Founder and Head Coach, SG Sink Or Swim

Every few years, usually during the drier months between June and September, a smoky haze settles over Singapore and parents start messaging me the same question: should my child still go to swim lesson today? It's a genuinely good question, and the honest answer is "it depends," but not in a vague way. It depends on specific, checkable things: the current air quality reading, your child's own health, and how strenuous that day's lesson actually is.

I'm Coach Tan Meng Chew, or MC, and I run SG Sink Or Swim. I've already written about how PSI thresholds affect our cancellation decisions as a business. This article is different. It's written for you as a parent, focused specifically on your child's safety and health during a haze episode, so you can make an informed decision regardless of which provider you use.

Why Haze Is a Genuine Health Question, Not Just a Nuisance

Haze in Singapore is caused by fine particulate matter, largely PM2.5, small enough to be inhaled deep into the lungs. Unlike a bad smell or reduced visibility, which are the parts people notice first, the actual health concern is this fine particulate matter irritating the respiratory system and, at sustained higher concentrations, triggering broader health effects.

This matters specifically for swim lessons because swimming is a genuinely exertive activity. Unlike a leisurely walk, a lesson involves controlled but real physical effort: kicking, stroke work, controlled breathing patterns, and time spent standing at poolside between drills. All of that increases how much air, and therefore how much particulate matter, a child breathes in over the course of a session, compared with sitting quietly indoors.

Why Children Specifically Need Extra Care

This is the part I want to be very direct about, because it's the core of the question you're actually asking.

Children breathe faster relative to their body size than adults do. A child's respiratory rate is higher, which means they take in more air, and therefore proportionally more airborne particulate matter, for the same amount of time spent outdoors.

Their airways are smaller and still developing. A young child's respiratory system isn't fully mature, which makes it generally more reactive and more easily irritated by pollutants than an adult's.

Many children spend more time playing and exerting themselves outdoors relative to their size than adults typically do, and a swim lesson specifically adds sustained physical exertion into the mix.

Children with asthma or other respiratory conditions are at meaningfully higher risk. Haze is a well-recognised trigger for asthma flare-ups, and a child with even mild, well-controlled asthma can react more significantly during a haze episode than they would on a normal day.

Because of all this, standard public health guidance treats children, along with the elderly and those with existing heart or lung conditions, as a group that warrants more caution than the general population during haze.

Singapore's PSI System, Briefly

Singapore measures haze severity primarily through the Pollutant Standards Index, or PSI, published by the National Environment Agency as both a 24-hour rolling average and a more immediate 1-hour PM2.5 reading. The general public guidance bands run roughly as follows:

• 0–50 (Good): No health concern.

• 51–100 (Moderate): Generally safe for normal activity.

• 101–200 (Unhealthy): The Ministry of Health advises reducing prolonged or strenuous outdoor physical exertion.

• 201–300 (Very Unhealthy): Guidance shifts to avoiding outdoor activity.

• Above 300 (Hazardous): Avoid all outdoor activity, and consider an N95 mask for anyone who must be outdoors for extended periods.

I go into these bands in more detail, along with how they specifically shape our own scheduling decisions, in a separate article on haze and PSI thresholds. Here, I want to focus on what these numbers mean for your decision-making as a parent, specifically for your own child.

A Practical Way to Think About the Decision

Rather than a single hard rule, I'd encourage parents to weigh three things together.

1. The current 24-hour PSI reading, checked on the day. This is the main reference point. Below 100, a normal lesson is generally fine for a healthy child. Between 101 and 200, caution is warranted, and the right response often isn't a flat cancellation but a modification, shorter duration, less intense drilling, more breaks. Above 200, I'd lean toward pausing outdoor lessons for children specifically, given their higher vulnerability.

2. Your own child's health. A healthy child with no respiratory history can generally tolerate the lower end of the unhealthy band with sensible modifications. A child with asthma, frequent respiratory infections, or any diagnosed lung or heart condition warrants a meaningfully more conservative personal threshold, regardless of what the general public guidance says is technically acceptable. If in doubt, this is exactly the kind of question worth a quick check with your child's doctor.

3. How strenuous that specific lesson would be. A gentle water-confidence session for a toddler, largely floating and play, is a different level of exertion than an older child's stroke-and-stamina drilling. The more strenuous the planned activity, the more conservative the threshold should be.

Symptoms to Watch For

Even with sensible precautions, it's worth knowing what to watch for during and after a lesson on a hazy day, since individual reactions can vary even within the "acceptable" guidance range.

• Coughing that starts or worsens during or shortly after the lesson

• Unusual shortness of breath or audible wheezing

• Eye irritation, redness or excessive tearing

• Throat irritation or an unusual sore throat afterward

• Unusual fatigue or reluctance to continue physical activity

• For a child with known asthma, any signs of a flare-up, including needing a reliever inhaler more than usual

If you notice any of these, it's a clear signal to stop the activity for that day, regardless of the official PSI reading, and to monitor your child afterward. A child who reacts this way once may be more sensitive than the general guidance assumes, and it's worth being more cautious for them specifically in future haze episodes.

What a Responsible Coach Should Do

Check current readings before a lesson, not rely on yesterday's number. Haze conditions in Singapore can shift within 24 to 48 hours, so a coach should be checking NEA's current data on the day, not assuming yesterday's air quality still applies.

Ask about your child's health history, especially during haze season. If your child has asthma or any respiratory sensitivity, a good coach wants to know this specifically, so they can apply a more conservative approach for your child even on days where the general guidance might permit a normal lesson.

Be willing to modify, not just proceed or cancel. A lesson can often be shortened, made less strenuous, or supplemented with more rest breaks rather than treated as an all-or-nothing decision.

Communicate proactively on borderline days. Rather than leaving you to guess, a good coach reaches out when conditions are uncertain, rather than assuming a lesson will simply proceed as scheduled.

Take a full pause seriously when conditions call for it. At the higher end of the unhealthy band and beyond, a coach who insists a swim lesson can safely proceed as normal isn't exercising good judgement, regardless of what a facility's own operating status says.

What You Can Do as a Parent

Check NEA's readings yourself before heading out. The myENV app and NEA's website show current 24-hour PSI and 1-hour PM2.5 readings. This takes under a minute and means you're not relying solely on a venue or provider's own assessment.

Tell your child's coach about any respiratory history, ideally before haze season begins, not only on the day conditions turn bad.

Trust your own observation of your child over the general guidance, if your child has ever shown sensitivity to poor air quality before. General public health bands are built for the population as a whole, not calibrated to your specific child.

Have a mask ready for the commute, even if the lesson itself proceeds. The trip to and from the pool is outdoor exposure too.

Don't feel pressured to attend "because it's already paid for." A responsible swim provider should offer a free makeup lesson for a haze-related pause, exactly as they would for a rained-out session, so there should be no financial reason to push your child through a lesson you're uncomfortable with.

Consider an indoor pool during a prolonged haze episode, if one is accessible to you, since it removes the exposure question entirely for that session.

A Note on Balance

I don't want this article to make haze sound more frightening than it usually is. Most haze episodes in Singapore sit in the moderate range and pass within days, and the vast majority of swim lessons during haze season proceed entirely normally without any issue. The goal here isn't anxiety, it's simply making sure that on the days when conditions are genuinely elevated, you're checking real numbers rather than guesswork, and applying a bit of extra caution specifically because your child is in a more vulnerable group than a healthy adult.

How SG Sink Or Swim Approaches This for Children Specifically

We check current conditions, not assumptions. Our coaches monitor NEA's 24-hour PSI readings on the day, rather than relying on yesterday's conditions or a fixed weekly assumption.

We ask about respiratory health upfront. If your child has asthma or any other respiratory condition, tell us, and we'll apply a more conservative approach for your child specifically, even on days where the general guidance might permit a normal lesson for other students.

We modify before we cancel, where it's sensible to do so. A shorter, gentler session is often the right call at moderately elevated readings, rather than an all-or-nothing decision.

We pause outdoor lessons at higher readings, without hesitation. At the more severe end of the guidance bands, we err on the side of caution for children specifically.

Free makeup lessons for haze-related pauses, on the same terms as any other weather-related disruption, so there's never a financial reason to push through a lesson you're not comfortable with.

Certified coaches making these calls. Our coaches hold NROC-recognised swimming qualifications and are certified SwimSafer Instructors with current first aid and CPR/AED certification. Ask us for the details and verify them yourself on CoachSG's National Register of Coaches.

To flag a health consideration for your child, or to check on a specific lesson during a haze episode, call (65) 9113 1462 or visit sgsinkorswim.com.

Frequently Asked Questions

Is it generally safe for children to swim outdoors during haze?

At lower PSI readings, generally yes, for healthy children. As readings climb into the unhealthy band and beyond, caution and eventually avoidance become the appropriate response, and children warrant more caution than healthy adults at any given reading.

What PSI reading should I personally worry about for my child?

Standard guidance calls for reducing strenuous outdoor exertion from PSI 101, and avoiding outdoor activity above 200. If your child has asthma or a respiratory condition, apply a more conservative threshold than this general guidance.

My child has asthma. Should they skip swim lessons entirely during haze season?

Not necessarily entirely, but a more cautious, individualised approach is warranted. This is worth discussing directly with your child's doctor and with your coach.

What symptoms should make me stop a lesson immediately, regardless of the official reading?

Coughing, unusual shortness of breath or wheezing, eye or throat irritation, unusual fatigue, or any sign of an asthma flare-up.

Should I check air quality myself, or just trust the pool or coach?

Both. Checking NEA's own readings takes under a minute and means you're making an informed decision rather than relying entirely on someone else's assessment.

Will I get a makeup lesson if haze affects my child's session?

Yes, on the same terms as any other weather-related disruption, a free makeup lesson with no forms and no penalty fees.

Is an indoor pool safer during haze?

Generally yes, since it removes outdoor air exposure during the lesson itself, though the commute there and back is still outdoor exposure.

How do I get started with a coach who takes this seriously?

Book a trial lesson, and tell us about any respiratory health considerations for your child so we can apply the right level of caution during future haze episodes.

Final Thoughts

Haze doesn't mean children should stop swimming altogether, but it does mean applying real, specific caution rather than guessing. Check the current 24-hour PSI reading, factor in your own child's health history, watch for symptoms during and after a lesson, and don't hesitate to pause or modify a session, even if the official guidance technically permits it, if something feels off for your specific child.

Most haze episodes pass without incident, and most lessons during haze season go ahead completely normally. The goal is simply making sure that on the days it matters, you're deciding from real information rather than assumption.

If you'd like to talk through how we handle haze days, or flag a health consideration for your child, SG Sink Or Swim is happy to help. You can reach us at (65) 9113 1462 or through sgsinkorswim.com.