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 30.8 PM2.5 9.5
SO2 4.3 PM10 14.3
O3 39.7
Air Quality Monitoring Stations Info
Kwai Chung AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 71.6 PM2.5 9.4
SO2 9.7 PM10 13.2
O3 15.5
Air Quality Monitoring Stations Info
Sham Shui Po AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 51.7 PM2.5 9.1
SO2 2.4 PM10 10.7
O3 21.9
Air Quality Monitoring Stations Info
Tai Po AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 45.6 PM2.5 -
SO2 1.0 PM10 -
O3 15.2
Air Quality Monitoring Stations Info
Tap Mun AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 3.4 PM2.5 5.0
SO2 5.4 PM10 15.7
O3 63.0
Air Quality Monitoring Stations Info
Tsuen Wan AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 39.7 PM2.5 -
SO2 4.0 PM10 0.0
O3 24.9
Air Quality Monitoring Stations Info
Tung Chung AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 13.1 PM2.5 4.8
SO2 4.4 PM10 7.4
O3 62.9
Air Quality Monitoring Stations Info
Yuen Long AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 47.0 PM2.5 2.8
SO2 5.4 PM10 4.8
O3 23.8
Air Quality Monitoring Stations Info
Causeway Bay AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 78.4 PM2.5 15.5
SO2 3.1 PM10 21.7
O3 14.8
Air Quality Monitoring Stations Info
Central AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 102.2 PM2.5 -
SO2 5.7 PM10 0.3
O3 4.9
Air Quality Monitoring Stations Info
Sha Tin AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 22.8 PM2.5 -
SO2 0.4 PM10 5.1
O3 51.1
Air Quality Monitoring Stations Info
Kwun Tong AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 41.5 PM2.5 4.1
SO2 1.6 PM10 10.0
O3 33.5
Air Quality Monitoring Stations Info
Tseung Kwan O AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 20.5 PM2.5 1.3
SO2 2.0 PM10 9.3
O3 50.0
Air Quality Monitoring Stations Info
Eastern AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 43.4 PM2.5 2.4
SO2 0.5 PM10 10.0
O3 39.4
Air Quality Monitoring Stations Info
Mong Kok AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 90.6 PM2.5 8.4
SO2 2.6 PM10 13.5
O3 8.3
Air Quality Monitoring Stations Info
Tuen Mun AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 55.2 PM2.5 9.1
SO2 6.1 PM10 14.8
O3 24.8
General Station
Roadside Station
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Last revision date:13:07 23-06-2018