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 50.9 PM2.5 24.9
SO2 5.4 PM10 37.7
O3 92.1
Air Quality Monitoring Stations Info
Kwai Chung AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 75.3 PM2.5 27.5
SO2 3.6 PM10 45.2
O3 83.9
Air Quality Monitoring Stations Info
Sham Shui Po AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 75.2 PM2.5 -
SO2 2.6 PM10 -
O3 69.3
Air Quality Monitoring Stations Info
Tai Po AQHI 6
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 64.1 PM2.5 30.4
SO2 1.8 PM10 44.2
O3 102.1
Air Quality Monitoring Stations Info
Tap Mun AQHI 6
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 11.1 PM2.5 35.3
SO2 7.0 PM10 60.2
O3 135.4
Air Quality Monitoring Stations Info
Tsuen Wan AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 71.9 PM2.5 32.1
SO2 9.6 PM10 45.7
O3 88.0
Air Quality Monitoring Stations Info
Tung Chung AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 73.8 PM2.5 38.8
SO2 6.6 PM10 65.5
O3 87.8
Air Quality Monitoring Stations Info
Yuen Long AQHI 6
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 55.5 PM2.5 34.0
SO2 8.1 PM10 67.1
O3 104.6
Air Quality Monitoring Stations Info
Causeway Bay AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 140.6 PM2.5 36.9
SO2 10.7 PM10 57.0
O3 16.6
Air Quality Monitoring Stations Info
Central AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 115.3 PM2.5 23.3
SO2 5.6 PM10 28.9
O3 40.2
Air Quality Monitoring Stations Info
Sha Tin AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 26.1 PM2.5 28.1
SO2 5.2 PM10 37.2
O3 120.6
Air Quality Monitoring Stations Info
Kwun Tong AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 71.9 PM2.5 31.0
SO2 4.2 PM10 52.9
O3 78.8
Air Quality Monitoring Stations Info
Tseung Kwan O AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 17.6 PM2.5 24.1
SO2 7.0 PM10 40.7
O3 136.1
Air Quality Monitoring Stations Info
Eastern AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 48.4 PM2.5 20.3
SO2 2.6 PM10 44.0
O3 112.1
Air Quality Monitoring Stations Info
Mong Kok AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 95.4 PM2.5 -
SO2 3.2 PM10 -
O3 49.6
Air Quality Monitoring Stations Info
Tuen Mun AQHI 6
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 - PM2.5 43.9
SO2 - PM10 71.8
O3 -
General Station
Roadside Station
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Last revision date:00:06 24-11-2017