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 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 17.2 PM2.5 6.8
SO2 31.5 PM10 10.6
O3 41.1
Air Quality Monitoring Stations Info
Kwai Chung AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 19.8 PM2.5 7.7
SO2 3.0 PM10 10.4
O3 34.8
Air Quality Monitoring Stations Info
Sham Shui Po AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 15.2 PM2.5 6.4
SO2 4.4 PM10 14.2
O3 37.2
Air Quality Monitoring Stations Info
Tai Po AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 7.2 PM2.5 5.0
SO2 4.4 PM10 8.3
O3 51.0
Air Quality Monitoring Stations Info
Tap Mun AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 1.3 PM2.5 4.4
SO2 2.2 PM10 13.2
O3 54.7
Air Quality Monitoring Stations Info
Tsuen Wan AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 - PM2.5 6.7
SO2 - PM10 10.8
O3 -
Air Quality Monitoring Stations Info
Tung Chung AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 - PM2.5 5.7
SO2 - PM10 10.8
O3 -
Air Quality Monitoring Stations Info
Yuen Long AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 - PM2.5 5.1
SO2 - PM10 7.4
O3 -
Air Quality Monitoring Stations Info
Causeway Bay AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 40.1 PM2.5 11.6
SO2 4.4 PM10 19.6
O3 19.1
Air Quality Monitoring Stations Info
Central AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 15.5 PM2.5 4.4
SO2 3.8 PM10 8.9
O3 40.5
Air Quality Monitoring Stations Info
Sha Tin AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 8.2 PM2.5 6.9
SO2 4.4 PM10 12.1
O3 48.9
Air Quality Monitoring Stations Info
Kwun Tong AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 11.2 PM2.5 4.0
SO2 7.1 PM10 7.9
O3 43.4
Air Quality Monitoring Stations Info
Tseung Kwan O AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 6.1 PM2.5 6.7
SO2 2.9 PM10 14.6
O3 46.4
Air Quality Monitoring Stations Info
Eastern AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 13.2 PM2.5 6.5
SO2 1.2 PM10 13.8
O3 44.1
Air Quality Monitoring Stations Info
Mong Kok AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 42.2 PM2.5 9.5
SO2 2.3 PM10 13.5
O3 18.7
Air Quality Monitoring Stations Info
Tuen Mun AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 9.2 PM2.5 6.1
SO2 2.1 PM10 11.1
O3 42.8
General Station
Roadside Station
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Last revision date:17:07 21-07-2019