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 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 24.6 PM2.5 25.1
SO2 1.2 PM10 40.4
O3 74.7
Air Quality Monitoring Stations Info
Kwai Chung AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 36.0 PM2.5 20.1
SO2 5.3 PM10 34.3
O3 61.9
Air Quality Monitoring Stations Info
Sham Shui Po AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 40.0 PM2.5 20.8
SO2 3.4 PM10 41.0
O3 62.1
Air Quality Monitoring Stations Info
Tai Po AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 23.1 PM2.5 22.1
SO2 1.7 PM10 37.8
O3 76.1
Air Quality Monitoring Stations Info
Tap Mun AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 8.2 PM2.5 19.3
SO2 10.1 PM10 41.6
O3 89.8
Air Quality Monitoring Stations Info
Tsuen Wan AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 - PM2.5 23.3
SO2 - PM10 33.4
O3 -
Air Quality Monitoring Stations Info
Tung Chung AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 - PM2.5 21.7
SO2 - PM10 39.7
O3 -
Air Quality Monitoring Stations Info
Yuen Long AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 - PM2.5 19.1
SO2 - PM10 25.5
O3 -
Air Quality Monitoring Stations Info
Causeway Bay AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 62.4 PM2.5 37.0
SO2 2.8 PM10 60.6
O3 33.4
Air Quality Monitoring Stations Info
Central AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 40.7 PM2.5 23.9
SO2 2.4 PM10 40.4
O3 61.6
Air Quality Monitoring Stations Info
Sha Tin AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 19.1 PM2.5 13.0
SO2 5.0 PM10 31.6
O3 82.1
Air Quality Monitoring Stations Info
Kwun Tong AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 17.1 PM2.5 22.0
SO2 4.8 PM10 42.0
O3 77.0
Air Quality Monitoring Stations Info
Tseung Kwan O AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 13.6 PM2.5 21.6
SO2 4.9 PM10 39.6
O3 89.8
Air Quality Monitoring Stations Info
Eastern AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 24.2 PM2.5 25.6
SO2 0.9 PM10 41.4
O3 71.1
Air Quality Monitoring Stations Info
Mong Kok AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 51.4 PM2.5 26.8
SO2 1.8 PM10 42.4
O3 44.5
Air Quality Monitoring Stations Info
Tuen Mun AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 20.4 PM2.5 22.0
SO2 0.1 PM10 33.2
O3 71.3
General Station
Roadside Station
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Last revision date:20:07 22-02-2019