Trend Charts as at 02:00 AM on 14 Jul 2017


1-hr PM2.5 concentration
At 2am on 14 Jul 2017
PM2.5 : Particulate matter of 2.5 microns or smaller in diameter
PM10 : Particulate matter of 10 microns or smaller in diameter
SO2 : Sulphur Dioxide
O3 : Ozone
CO  : Carbon Monoxide
NO2 : Nitrogen Dioxide
Pollutant Concentration
1-hr PM2.5 conc.



Pollutant Sub-indices
PM2.5 sub-index
PM10 sub-index
SO2 sub-index
O3 sub-index
CO sub-index
NO2 sub-index




The real-time data is automatically published as soon as it is generated by our air monitoring stations. The data is subject to verification and correction subsequently if necessary.

1-hr PM 2.5 conc (µg/m3) Band Descriptor
0 - 55 I Normal
56 - 150 II Elevated
151 - 250 III High
Above 250 IV Very High