As of 1am on Thursday, the 24-hour PSI readings ranged between 127 and 152.
According to the National Environment Agency , PSI readings of 50 and below denote “good” air quality, “moderate” for 51-100 and “unhealthy” for 101-200.90-111µg/m3 at 1am on Thursday, in the elevated band which ranges from 56-150µg/m3. PM2.5 is a measure of tiny particles less than 2.5 micrometres in diameter in the air. When the PM2.5 reading is in the elevated range, haze particles can affect the heart and lungs, especially in people who have chronic heart or lung conditions.
According to NEA, one-hour PM2.5 readings are a"good indicator of current air quality", and can be used for those deciding whether to go for immediate outdoor activities, such as a jog.
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