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 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 43.3 PM2.5 20.8
SO2 1.0 PM10 33.4
O3 92.5
Air Quality Monitoring Stations Info
Kwai Chung AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 60.5 PM2.5 21.6
SO2 4.5 PM10 41.2
O3 75.1
Air Quality Monitoring Stations Info
Sham Shui Po AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 80.4 PM2.5 27.7
SO2 4.4 PM10 35.9
O3 57.8
Air Quality Monitoring Stations Info
Tai Po AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 26.8 PM2.5 18.5
SO2 3.0 PM10 27.5
O3 108.2
Air Quality Monitoring Stations Info
Tap Mun AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 5.4 PM2.5 16.5
SO2 7.1 PM10 28.3
O3 121.9
Air Quality Monitoring Stations Info
Tsuen Wan AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 66.6 PM2.5 20.1
SO2 12.0 PM10 37.1
O3 62.1
Air Quality Monitoring Stations Info
Tung Chung AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 44.7 PM2.5 18.4
SO2 13.8 PM10 31.6
O3 62.6
Air Quality Monitoring Stations Info
Yuen Long AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 39.5 PM2.5 19.2
SO2 7.6 PM10 45.7
O3 85.5
Air Quality Monitoring Stations Info
Causeway Bay AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 108.8 PM2.5 29.9
SO2 6.2 PM10 49.7
O3 31.7
Air Quality Monitoring Stations Info
Central AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 139.5 PM2.5 25.8
SO2 9.1 PM10 40.0
O3 17.1
Air Quality Monitoring Stations Info
Sha Tin AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 32.3 PM2.5 -
SO2 2.4 PM10 14.6
O3 103.6
Air Quality Monitoring Stations Info
Kwun Tong AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 48.7 PM2.5 27.0
SO2 4.8 PM10 53.7
O3 70.8
Air Quality Monitoring Stations Info
Tseung Kwan O AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 15.5 PM2.5 14.2
SO2 - PM10 23.9
O3 119.0
Air Quality Monitoring Stations Info
Eastern AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 47.5 PM2.5 14.9
SO2 2.4 PM10 31.0
O3 95.1
Air Quality Monitoring Stations Info
Mong Kok AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 92.1 PM2.5 27.1
SO2 2.8 PM10 37.9
O3 55.2
Air Quality Monitoring Stations Info
Tuen Mun AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 58.5 PM2.5 25.9
SO2 12.8 PM10 41.1
O3 79.4
General Station
Roadside Station
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Last revision date:18:07 22-10-2018