Right now, the official policy is that schools will CONSIDER close when the 24-hour rolling PSI hits 300 (Hazardous).
To put that into perspective, a PSI of 300 requires a 24-hour average PM2.5 concentration of 250 ¾g/m³. Sudden spike of PM2.5 concentration of 300 in the morning will not show PSI 300. The WHO safety guideline for daily exposure is 15 ¾g/m³.
By the time the government still considering to close schools, our children will have already been breathing in toxins, highly concentrated PM2.5 for days.
Currently, school were asked to turn on portable air purifiers inside classroom. All primary and secondary classrooms rely on natural ventilation (NO air conditioning). If you keep windows open, air purifiers do not work properly, according to NEA own guideline. If you keep windows closed, 35 students are packed inside classroom fighting for oxygen.
In Malaysia, schools are legally mandated to close nationwide the moment the 24-hour API hits 200, which corresponds to a PM2.5 level of roughly 150 ¾g/m³. Singapore waits until the air is nearly twice as toxic (average of roughly 250 ¾g/m³) to take the same action.
Children breathe faster than adults, their organs are still developing and hence they face higher chances of permanent damage to respiratory, cardiovascular system and brain development issues from prolonged PM2.5 exposure.
Not to mention some students who commute to school daily by walking or public transport and teachers forced to be working in unsafe environment.
Why canât we do better to protect the children? Air purifiers inside a natural ventilated classroom is more of placebo effect than safety protocol.