Air quality in all regions of Singapore in unhealthy range; central area the worst with 24-hour PSI at 154
This is the first time since September 2019 that air quailty in all regions in the country entered the unhealthy range.
On Monday morning, Sep. 14, air quality in central Singapore nearly reached the unhealthy range. The 24-hour Pollutant Standards Index (PSI) reading at 11am fell between 78 and 99, placing it in the moderate range according to the National Environment Agency (NEA) website. The unhealthy range begins at 101 and 200. The public was advised to limit prolonged or intense outdoor physical activity if the 24-hr PSI reading entered the unhealthy range.
Central Singapore was particularly hazy just before noon. The NEA reported a one-hour PM2.5 reading of 113 in central Singapore just before 10am. PM2.5 refers to the concentration of tiny airborne particles under a single hour. This reading serves as a real-time indicator of air quality during hazy conditions. PM2.5 particles are less than 2.5 micrometres in diameter. Readings between 56 and 150 indicate an elevated range, while readings between 151 and 250 suggest a high range.
Those planning outdoor activities should refer to the one-hour PM2.5 concentration reading. Vulnerable individuals are urged to follow the NEA's guidance on outdoor activities during haze episodes.
Written by urgent.news from Mothership's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
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