SINGAPORE -Singaporeans may breathe better when they wake up on Monday morning, with improvements to the air quality expected.
As at 7pm on Sunday, the 24-hour PSI was 97-105, within the"moderate" to the low end of the"unhealthy" range. A PSI reading of zero to 50 indicates that the air quality is good, while a reading of 51 to 100 is in the"moderate" range. The air quality is considered to be"very unhealthy" when the PSI ranges from 201 to 300, and it is"hazardous" when the reading goes above 300.
The one-hour PM2.5 reading at 7pm on Sunday was between the same bands, at 45 to 64 micrograms per cubic metre.
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