About AQHI - How is the AQHI calculated and reported?

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How is the AQHI calculated and reported?

AQHIs are calculated based on the cumulative health risk attributable to the 3-hour moving average concentrations of four air pollutants namely, ozone (O3), nitrogen dioxide (NO2), sulphur dioxide (SO2) and particulate matter (PM2.5/ PM10). The risk factors of each pollutant were obtained from local health studies. aqms.jpg
The map below shows the locations of air quality monitoring stations.

Air Quality Monitoring Stations Info
Central/Western AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 - PM2.5 6.4
SO2 - PM10 10.9
O3 -
Air Quality Monitoring Stations Info
Kwai Chung AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 47.0 PM2.5 6.8
SO2 6.4 PM10 17.6
O3 21.5
Air Quality Monitoring Stations Info
Sham Shui Po AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 27.3 PM2.5 4.3
SO2 8.3 PM10 17.0
O3 39.6
Air Quality Monitoring Stations Info
Tai Po AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 13.9 PM2.5 5.7
SO2 1.7 PM10 10.0
O3 46.1
Air Quality Monitoring Stations Info
Tap Mun AQHI -
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 - PM2.5 3.3
SO2 - PM10 7.5
O3 -
Air Quality Monitoring Stations Info
Tsuen Wan AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 15.0 PM2.5 4.6
SO2 4.7 PM10 9.6
O3 36.1
Air Quality Monitoring Stations Info
Tung Chung AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 3.7 PM2.5 5.8
SO2 0.9 PM10 11.7
O3 42.9
Air Quality Monitoring Stations Info
Yuen Long AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 16.4 PM2.5 6.0
SO2 3.0 PM10 14.5
O3 36.7
Air Quality Monitoring Stations Info
Causeway Bay AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 25.9 PM2.5 9.8
SO2 2.6 PM10 17.7
O3 37.7
Air Quality Monitoring Stations Info
Central AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 29.9 PM2.5 5.4
SO2 2.3 PM10 11.0
O3 39.9
Air Quality Monitoring Stations Info
Sha Tin AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 18.1 PM2.5 7.7
SO2 6.0 PM10 14.6
O3 43.4
Air Quality Monitoring Stations Info
Kwun Tong AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 44.1 PM2.5 7.7
SO2 4.4 PM10 15.4
O3 21.4
Air Quality Monitoring Stations Info
Tseung Kwan O AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 16.4 PM2.5 3.7
SO2 3.8 PM10 12.8
O3 45.3
Air Quality Monitoring Stations Info
Eastern AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 14.0 PM2.5 5.3
SO2 1.1 PM10 14.4
O3 45.3
Air Quality Monitoring Stations Info
Mong Kok AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 95.1 PM2.5 9.9
SO2 6.1 PM10 17.0
O3 11.3
Air Quality Monitoring Stations Info
Tuen Mun AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 21.9 PM2.5 8.0
SO2 1.2 PM10 12.1
O3 40.9
General Station
Roadside Station
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Last revision date:05:07 05-06-2020