WussRedXLi
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My AQI reading for 1am (from Asia Air Quality App) now is 166 (Central), 180 (South).
Air Pollution in Singapore: Real-time Air Quality Index Visual Map
But 1-hr PM2.5 (from NEA) reading as at 1am only range from 18 to 33.
They are using NEA's 24-hr ug/m3 figure.
Now 7AM, West AQI is 104 as reported on aqicn. NEA 24-hr is 35 ug/m3, actually it's a bit off but it makes sense.
South and East same value, Central/North same.
First section, rightmost
Pollutant Concentrations
Explained here
Singapore PSI and PM2.5 AQI: Why is there a difference between the two readings?

