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 111.5 PM2.5 26.7
SO2 4.3 PM10 36.3
O3 35.9
Air Quality Monitoring Stations Info
Kwai Chung AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 124.6 PM2.5 21.6
SO2 12.9 PM10 29.8
O3 13.2
Air Quality Monitoring Stations Info
Sham Shui Po AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 89.0 PM2.5 23.7
SO2 8.9 PM10 33.7
O3 37.6
Air Quality Monitoring Stations Info
Tai Po AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 41.7 PM2.5 22.4
SO2 7.1 PM10 28.7
O3 93.9
Air Quality Monitoring Stations Info
Tap Mun AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 4.5 PM2.5 24.1
SO2 3.8 PM10 33.4
O3 118.7
Air Quality Monitoring Stations Info
Tsuen Wan AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 71.4 PM2.5 20.4
SO2 11.8 PM10 29.2
O3 58.1
Air Quality Monitoring Stations Info
Tung Chung AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 31.3 PM2.5 24.9
SO2 5.2 PM10 33.5
O3 107.5
Air Quality Monitoring Stations Info
Yuen Long AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 47.0 PM2.5 28.3
SO2 10.3 PM10 29.4
O3 92.9
Air Quality Monitoring Stations Info
Causeway Bay AQHI 6
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 175.6 PM2.5 42.7
SO2 6.6 PM10 57.3
O3 12.9
Air Quality Monitoring Stations Info
Central AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 155.2 PM2.5 33.6
SO2 - PM10 43.7
O3 16.4
Air Quality Monitoring Stations Info
Sha Tin AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 77.8 PM2.5 19.9
SO2 16.2 PM10 33.8
O3 57.6
Air Quality Monitoring Stations Info
Kwun Tong AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 66.2 PM2.5 25.0
SO2 6.8 PM10 48.0
O3 78.2
Air Quality Monitoring Stations Info
Tseung Kwan O AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 55.7 PM2.5 23.4
SO2 5.9 PM10 38.3
O3 92.3
Air Quality Monitoring Stations Info
Eastern AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 44.1 PM2.5 21.2
SO2 3.9 PM10 27.3
O3 100.3
Air Quality Monitoring Stations Info
Mong Kok AQHI 6
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 156.8 PM2.5 26.7
SO2 6.9 PM10 35.3
O3 18.6
Air Quality Monitoring Stations Info
Tuen Mun AQHI 5
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 57.2 PM2.5 22.1
SO2 6.4 PM10 33.1
O3 84.0
General Station
Roadside Station
Last revision date:03:07 16-09-2019