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 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 16.6 PM2.5 14.0
SO2 2.8 PM10 28.5
O3 90.9
Air Quality Monitoring Stations Info
Kwai Chung AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 22.9 PM2.5 17.6
SO2 7.3 PM10 36.1
O3 87.4
Air Quality Monitoring Stations Info
Sham Shui Po AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 28.0 PM2.5 14.3
SO2 6.5 PM10 30.6
O3 76.5
Air Quality Monitoring Stations Info
Tai Po AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 17.9 PM2.5 17.0
SO2 3.8 PM10 33.4
O3 93.2
Air Quality Monitoring Stations Info
Tap Mun AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 - PM2.5 11.3
SO2 - PM10 33.5
O3 -
Air Quality Monitoring Stations Info
Tsuen Wan AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 24.7 PM2.5 18.5
SO2 2.0 PM10 34.7
O3 75.6
Air Quality Monitoring Stations Info
Tung Chung AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 15.0 PM2.5 10.7
SO2 2.3 PM10 24.4
O3 93.4
Air Quality Monitoring Stations Info
Yuen Long AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 34.4 PM2.5 16.7
SO2 4.4 PM10 51.1
O3 70.7
Air Quality Monitoring Stations Info
Causeway Bay AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 46.9 PM2.5 13.6
SO2 1.9 PM10 34.0
O3 63.2
Air Quality Monitoring Stations Info
Central AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 38.8 PM2.5 16.3
SO2 3.6 PM10 34.0
O3 76.2
Air Quality Monitoring Stations Info
Sha Tin AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 8.3 PM2.5 9.0
SO2 5.0 PM10 27.6
O3 102.2
Air Quality Monitoring Stations Info
Kwun Tong AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 18.0 PM2.5 17.0
SO2 4.4 PM10 46.1
O3 90.6
Air Quality Monitoring Stations Info
Tseung Kwan O AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 14.5 PM2.5 14.7
SO2 2.9 PM10 32.7
O3 98.1
Air Quality Monitoring Stations Info
Eastern AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 20.3 PM2.5 13.1
SO2 1.6 PM10 34.5
O3 85.8
Air Quality Monitoring Stations Info
Mong Kok AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 64.4 PM2.5 17.6
SO2 1.8 PM10 34.7
O3 44.8
Air Quality Monitoring Stations Info
Tuen Mun AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 27.4 PM2.5 23.8
SO2 2.6 PM10 42.0
O3 79.8
General Station
Roadside Station
Last revision date:13:06 14-11-2019