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 36.3 PM2.5 35.1
SO2 4.6 PM10 59.2
O3 84.2
Air Quality Monitoring Stations Info
Kwai Chung AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 39.9 PM2.5 25.5
SO2 5.5 PM10 44.9
O3 76.1
Air Quality Monitoring Stations Info
Sham Shui Po AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 40.9 PM2.5 25.4
SO2 7.0 PM10 45.6
O3 81.9
Air Quality Monitoring Stations Info
Tai Po AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 36.4 PM2.5 28.2
SO2 3.6 PM10 50.2
O3 93.3
Air Quality Monitoring Stations Info
Tap Mun AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 8.9 PM2.5 19.7
SO2 8.2 PM10 46.1
O3 101.7
Air Quality Monitoring Stations Info
Tsuen Wan AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 - PM2.5 29.9
SO2 - PM10 50.0
O3 -
Air Quality Monitoring Stations Info
Tung Chung AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 - PM2.5 19.8
SO2 - PM10 37.2
O3 -
Air Quality Monitoring Stations Info
Yuen Long AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 - PM2.5 20.6
SO2 - PM10 41.3
O3 -
Air Quality Monitoring Stations Info
Causeway Bay AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 64.1 PM2.5 33.5
SO2 7.4 PM10 56.5
O3 50.2
Air Quality Monitoring Stations Info
Central AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 63.4 PM2.5 27.8
SO2 6.2 PM10 54.2
O3 62.9
Air Quality Monitoring Stations Info
Sha Tin AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 34.3 PM2.5 23.4
SO2 7.4 PM10 49.2
O3 83.9
Air Quality Monitoring Stations Info
Kwun Tong AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 29.2 PM2.5 27.6
SO2 10.2 PM10 57.0
O3 82.7
Air Quality Monitoring Stations Info
Tseung Kwan O AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 27.5 PM2.5 29.7
SO2 5.8 PM10 48.7
O3 91.3
Air Quality Monitoring Stations Info
Eastern AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 51.5 PM2.5 29.1
SO2 3.1 PM10 60.1
O3 64.4
Air Quality Monitoring Stations Info
Mong Kok AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 72.7 PM2.5 36.1
SO2 8.5 PM10 59.3
O3 45.2
Air Quality Monitoring Stations Info
Tuen Mun AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 43.5 PM2.5 33.0
SO2 9.1 PM10 54.9
O3 75.5
General Station
Roadside Station
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Last revision date:09:07 13-12-2018