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 11.8 PM2.5 2.2
SO2 3.9 PM10 5.2
O3 41.8
Air Quality Monitoring Stations Info
Kwai Chung AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 13.4 PM2.5 5.7
SO2 3.2 PM10 8.1
O3 40.0
Air Quality Monitoring Stations Info
Sham Shui Po AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 19.1 PM2.5 2.2
SO2 2.5 PM10 11.1
O3 37.4
Air Quality Monitoring Stations Info
Tai Po AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 16.2 PM2.5 0.4
SO2 2.2 PM10 3.2
O3 41.5
Air Quality Monitoring Stations Info
Tap Mun AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 - PM2.5 2.3
SO2 - PM10 9.6
O3 -
Air Quality Monitoring Stations Info
Tsuen Wan AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 11.2 PM2.5 2.3
SO2 4.2 PM10 5.0
O3 37.5
Air Quality Monitoring Stations Info
Tung Chung AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 6.1 PM2.5 3.2
SO2 1.2 PM10 8.4
O3 44.5
Air Quality Monitoring Stations Info
Yuen Long AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 13.4 PM2.5 -
SO2 2.6 PM10 3.0
O3 29.0
Air Quality Monitoring Stations Info
Causeway Bay AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 40.1 PM2.5 5.9
SO2 3.8 PM10 11.6
O3 21.9
Air Quality Monitoring Stations Info
Central AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 33.7 PM2.5 0.8
SO2 3.1 PM10 5.6
O3 31.2
Air Quality Monitoring Stations Info
Sha Tin AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 5.5 PM2.5 6.6
SO2 1.9 PM10 9.8
O3 49.3
Air Quality Monitoring Stations Info
Kwun Tong AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 18.6 PM2.5 5.0
SO2 3.9 PM10 17.9
O3 33.8
Air Quality Monitoring Stations Info
Tseung Kwan O AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 7.1 PM2.5 0.0
SO2 4.2 PM10 9.9
O3 47.4
Air Quality Monitoring Stations Info
Eastern AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 16.1 PM2.5 4.0
SO2 1.2 PM10 11.9
O3 30.2
Air Quality Monitoring Stations Info
Mong Kok AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 34.7 PM2.5 5.1
SO2 1.7 PM10 10.0
O3 25.1
Air Quality Monitoring Stations Info
Tuen Mun AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 16.0 PM2.5 5.0
SO2 0.3 PM10 5.0
O3 38.3
Air Quality Monitoring Stations Info
Southern AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 22.8 PM2.5 2.9
SO2 1.6 PM10 9.9
O3 39.7
Air Quality Monitoring Stations Info
North AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 11.3 PM2.5 1.7
SO2 3.0 PM10 5.7
O3 44.8
General Station
Roadside Station
Last revision date:19:07 09-08-2020