About AQHI - How is the AQHI calculated and reported?

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How is the AQHI calculated and reported?

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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.

The map below shows the locations of air quality monitoring stations.

Air Quality Monitoring Stations Info
Central/Western AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 15.7 PM2.5 13.0
SO2 4.9 PM10 15.7
O3 62.8
Air Quality Monitoring Stations Info
Kwai Chung AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 24.7 PM2.5 16.3
SO2 9.9 PM10 22.9
O3 49.3
Air Quality Monitoring Stations Info
Sham Shui Po AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 22.8 PM2.5 9.0
SO2 3.5 PM10 19.2
O3 54.1
Air Quality Monitoring Stations Info
Tai Po AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 27.9 PM2.5 14.2
SO2 1.9 PM10 34.0
O3 47.7
Air Quality Monitoring Stations Info
Tap Mun AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 - PM2.5 15.5
SO2 - PM10 20.4
O3 -
Air Quality Monitoring Stations Info
Tsuen Wan AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 19.3 PM2.5 16.8
SO2 6.6 PM10 21.2
O3 50.6
Air Quality Monitoring Stations Info
Tung Chung AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 27.7 PM2.5 15.7
SO2 4.1 PM10 23.0
O3 40.4
Air Quality Monitoring Stations Info
Yuen Long AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 18.6 PM2.5 21.5
SO2 3.0 PM10 27.0
O3 50.6
Air Quality Monitoring Stations Info
Causeway Bay AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 43.6 PM2.5 19.7
SO2 2.0 PM10 26.9
O3 32.4
Air Quality Monitoring Stations Info
Central AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 29.0 PM2.5 12.5
SO2 3.0 PM10 16.5
O3 45.4
Air Quality Monitoring Stations Info
Sha Tin AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 - PM2.5 14.2
SO2 - PM10 23.1
O3 -
Air Quality Monitoring Stations Info
Kwun Tong AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 - PM2.5 -
SO2 - PM10 12.4
O3 -
Air Quality Monitoring Stations Info
Tseung Kwan O AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 11.1 PM2.5 11.4
SO2 1.7 PM10 15.0
O3 60.4
Air Quality Monitoring Stations Info
Eastern AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 16.4 PM2.5 -
SO2 0.4 PM10 -
O3 59.5
Air Quality Monitoring Stations Info
Mong Kok AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 58.2 PM2.5 15.9
SO2 1.3 PM10 20.1
O3 25.2
Air Quality Monitoring Stations Info
Tuen Mun AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 - PM2.5 21.9
SO2 9.1 PM10 32.9
O3 49.5
General Station
Roadside Station
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Last revision date:02:07 20-05-2019