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 8.0 PM2.5 6.1
SO2 7.5 PM10 9.6
O3 49.8
Air Quality Monitoring Stations Info
Kwai Chung AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 49.0 PM2.5 8.8
SO2 7.6 PM10 12.4
O3 14.7
Air Quality Monitoring Stations Info
Sham Shui Po AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 - PM2.5 8.8
SO2 - PM10 14.4
O3 -
Air Quality Monitoring Stations Info
Tai Po AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 29.0 PM2.5 8.1
SO2 2.5 PM10 12.2
O3 21.4
Air Quality Monitoring Stations Info
Tap Mun AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 8.1 PM2.5 6.0
SO2 5.8 PM10 16.4
O3 24.7
Air Quality Monitoring Stations Info
Tsuen Wan AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 - PM2.5 3.9
SO2 - PM10 7.9
O3 -
Air Quality Monitoring Stations Info
Tung Chung AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 - PM2.5 3.5
SO2 - PM10 7.8
O3 -
Air Quality Monitoring Stations Info
Yuen Long AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 - PM2.5 9.1
SO2 - PM10 11.7
O3 -
Air Quality Monitoring Stations Info
Causeway Bay AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 44.9 PM2.5 12.8
SO2 3.9 PM10 20.5
O3 19.4
Air Quality Monitoring Stations Info
Central AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 65.6 PM2.5 7.2
SO2 6.7 PM10 13.1
O3 7.9
Air Quality Monitoring Stations Info
Sha Tin AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 22.2 PM2.5 -
SO2 8.6 PM10 12.5
O3 40.7
Air Quality Monitoring Stations Info
Kwun Tong AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 30.0 PM2.5 11.1
SO2 4.1 PM10 13.1
O3 33.2
Air Quality Monitoring Stations Info
Tseung Kwan O AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 54.0 PM2.5 6.9
SO2 5.9 PM10 11.2
O3 21.3
Air Quality Monitoring Stations Info
Eastern AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 11.1 PM2.5 6.2
SO2 2.3 PM10 9.2
O3 56.0
Air Quality Monitoring Stations Info
Mong Kok AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 47.2 PM2.5 7.6
SO2 4.1 PM10 10.9
O3 19.5
Air Quality Monitoring Stations Info
Tuen Mun AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 30.3 PM2.5 9.9
SO2 7.7 PM10 14.1
O3 37.5
General Station
Roadside Station
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Last revision date:18:07 18-08-2018