Preschool haze planning: 24-hour PSI forecast versus 1-hour PM2.5
Our earlier piece, Very unhealthy PSI: reported preschool rules and MOH's home advice, set out the preschool conditions CNA reported from the 9 October 2026 Haze Task Force advisory alongside MOH's advice for the home. This follow-up is deliberately narrower. It adds the planning-versus-adjustment decision written into Annex B of the Haze Task Force member agencies' action plans, and one scope distinction that is easy to misread: the annex prints a numeric outdoor-stop threshold, but in a paragraph addressed to a different group of people. [1]
On 4 September 2026, NEA said it would begin providing daily haze advisories from that evening, including the 24-hour PSI forecast, which it said the public could use in planning activities and events for the next 24 hours. That is the position as announced then. None of the passages we checked carries a current Singapore PSI figure or timestamped reading, so this article quotes none. [2]
Two readings, two decisions
NEA's FAQs sort the two figures by the decision each one serves. The 24-hour PSI forecast of daily haze conditions is described as less volatile, and NEA says individuals, institutions and companies will find it suitable for forward planning — that is, the next day — for outdoor activities or events that typically take place over many hours. The related advisory is also more appropriate when taking precautions for prolonged outdoor work. [3]
The 1-hour PM2.5 concentration reading answers the other question. NEA describes it as reflecting current air quality, meant for immediate decisions such as whether or not to go for a walk or run outdoors, likening it to checking that hour's weather forecast rather than the day's. Annex B gives preschools the same split in one clause: they use the 24-hour PSI forecast for forward planning, but adjust these plans as appropriate based on the 1-hour PM2.5 readings. [1] [3]
One hypothetical plan and reassessment
A hypothetical day, offered as an illustration rather than a rule. Suppose tomorrow's forecast sits in the Unhealthy band, so the activity plan is settled the evening before. Partway through the following morning the hourly PM2.5 reading rises. The annex wording lets staff adjust the plan as appropriate, a single clause covering the day's response, with no timetable attached to it. [1] [3]
Notice what that sentence does not contain. It attaches no PM2.5 value that must be crossed before a change is made, no time by which anyone must reassess, and no instruction to notify a parent at a particular moment. That describes the text as written, not every centre's practice. How your child's own centre reads the clause, and how it would tell you, is something only that centre can describe. [1]
Keep the senior-care threshold in its own scope
The numeric stop threshold sits a few items earlier in the same annex, and it addresses a different group. Community care providers offering residential and centre-based services to seniors should provide indoor shelter for staff and residents or clients, and minimise or avoid activities with prolonged or strenuous outdoor physical exertion, when the forecasted air quality is in the Unhealthy range, PSI above 100. Outdoor activities should cease or be replaced with indoor activities when the forecast reaches the Very Unhealthy range, PSI above 200. [1]
The preschool item names only the Unhealthy range at PSI above 100: preschools should minimise prolonged outdoor activities and strenuous indoor physical exercise and activities for children, and children with underlying chronic heart and lung conditions should not take part in outdoor activities and physical exercise during such times. The preschool passages we inspected carry no very unhealthy trigger of their own, which describes the text we checked rather than the state of all official guidance. Separately, CNA reported that the task force said all outdoor and strenuous indoor activities in preschools must stop when the air quality is in the very unhealthy range. That is reported advisory wording, not first-party text we inspected, and it is no reason to discount it. [1] [4]
Ask which reading, and which preschool source
Two questions are worth putting to your centre, offered as optional preparation rather than a required sequence. Which figure informs tomorrow's plan, and which hourly PM2.5 reading prompts a reassessment partway through a session? And which source supports the very unhealthy procedure your centre says it follows: the annex text, or the advisory wording CNA reported on 9 October 2026? [1] [4] [3]
The answer, once. Tomorrow is planned on the 24-hour PSI forecast; changes during the day are adjusted on the 1-hour PM2.5 reading; and the annex's above-200 outdoor-stop rule is written for senior community care, while a very unhealthy preschool step reaches parents through a reported task force advisory. Our sources cover preschools and, separately, senior community care. They say nothing about infant care centres, home-based care or the ECDA childminding pilot, and they answer nothing about an individual child's medication. [1] [4] [3]
Read next
Sources
- HTF MEMBER AGENCIES' ACTION PLANS
- government agencies' measures to mitigate the haze
- FAQs
- N95 masks to be distributed to more vulnerable individuals once 24-hour PSI exceeds 200: Haze Task Force – CNA
EduNanny Editorial · AI-assisted research and writing, reviewed by our automated editorial team. Sources checked 2026-10-10. Featured image: AI-generated editorial illustration.
