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 43.7 PM2.5 12.9
SO2 5.0 PM10 18.7
O3 42.2
Air Quality Monitoring Stations Info
Kwai Chung AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 98.6 PM2.5 -
SO2 10.9 PM10 -
O3 2.7
Air Quality Monitoring Stations Info
Sham Shui Po AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 68.4 PM2.5 11.5
SO2 5.1 PM10 23.1
O3 17.2
Air Quality Monitoring Stations Info
Tai Po AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 52.0 PM2.5 10.1
SO2 3.8 PM10 12.2
O3 30.3
Air Quality Monitoring Stations Info
Tap Mun AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 17.9 PM2.5 7.3
SO2 5.6 PM10 12.7
O3 63.4
Air Quality Monitoring Stations Info
Tsuen Wan AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 67.4 PM2.5 16.2
SO2 7.7 PM10 23.2
O3 10.4
Air Quality Monitoring Stations Info
Tung Chung AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 36.5 PM2.5 6.2
SO2 7.3 PM10 8.1
O3 37.2
Air Quality Monitoring Stations Info
Yuen Long AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 64.2 PM2.5 13.4
SO2 4.7 PM10 30.2
O3 20.4
Air Quality Monitoring Stations Info
Causeway Bay AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 151.0 PM2.5 24.4
SO2 12.5 PM10 35.7
O3 4.1
Air Quality Monitoring Stations Info
Central AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 89.4 PM2.5 18.7
SO2 7.7 PM10 24.5
O3 11.0
Air Quality Monitoring Stations Info
Sha Tin AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 66.9 PM2.5 9.3
SO2 4.0 PM10 14.8
O3 10.7
Air Quality Monitoring Stations Info
Kwun Tong AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 76.7 PM2.5 14.0
SO2 6.2 PM10 20.0
O3 15.0
Air Quality Monitoring Stations Info
Tseung Kwan O AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 49.9 PM2.5 1.3
SO2 2.8 PM10 11.1
O3 38.2
Air Quality Monitoring Stations Info
Eastern AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 59.1 PM2.5 2.4
SO2 0.5 PM10 14.5
O3 33.7
Air Quality Monitoring Stations Info
Mong Kok AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 104.4 PM2.5 19.8
SO2 4.9 PM10 28.8
O3 3.8
Air Quality Monitoring Stations Info
Tuen Mun AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 70.9 PM2.5 17.0
SO2 3.2 PM10 22.1
O3 14.3
General Station
Roadside Station
Last revision date:00:07 19-06-2019