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Update: Air quality in Singapore remains in unhealthy range on Monday; 24-hour PSI at noon: 121-145
SINGAPORE - Air quality remained in the unhealthy range on Monday (Sept 14) morning following a hazy weekend which kept Singaporeans away from outdoor activities.
The 24-hour Pollutant Standards Index (PSI) at 11am was between 121 and 145. The unhealthy range is 101-200. The three-hour PSI, an indicative reading not tied to health advisory, was 86 at noon after peaking at 222 at 1am.
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