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 26.7 PM2.5 39.0
SO2 7.3 PM10 59.5
O3 57.1
Air Quality Monitoring Stations Info
Kwai Chung AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 30.6 PM2.5 32.9
SO2 10.3 PM10 46.8
O3 53.1
Air Quality Monitoring Stations Info
Sham Shui Po AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 21.4 PM2.5 30.3
SO2 13.4 PM10 64.3
O3 60.4
Air Quality Monitoring Stations Info
Tai Po AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 24.4 PM2.5 39.8
SO2 10.3 PM10 61.2
O3 46.4
Air Quality Monitoring Stations Info
Tap Mun AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 - PM2.5 30.5
SO2 - PM10 49.1
O3 -
Air Quality Monitoring Stations Info
Tsuen Wan AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 26.8 PM2.5 29.9
SO2 5.2 PM10 46.5
O3 46.8
Air Quality Monitoring Stations Info
Tung Chung AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 38.9 PM2.5 34.7
SO2 8.7 PM10 62.9
O3 38.6
Air Quality Monitoring Stations Info
Yuen Long AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 37.2 PM2.5 46.2
SO2 8.6 PM10 84.5
O3 35.2
Air Quality Monitoring Stations Info
Causeway Bay AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 52.7 PM2.5 43.3
SO2 6.6 PM10 68.9
O3 31.3
Air Quality Monitoring Stations Info
Central AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 68.5 PM2.5 41.3
SO2 10.6 PM10 65.8
O3 26.5
Air Quality Monitoring Stations Info
Sha Tin AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 19.1 PM2.5 27.6
SO2 12.3 PM10 57.2
O3 58.2
Air Quality Monitoring Stations Info
Kwun Tong AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 26.3 PM2.5 35.7
SO2 9.5 PM10 79.0
O3 54.2
Air Quality Monitoring Stations Info
Tseung Kwan O AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 21.9 PM2.5 35.6
SO2 7.7 PM10 55.0
O3 58.7
Air Quality Monitoring Stations Info
Eastern AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 29.2 PM2.5 34.4
SO2 6.2 PM10 74.0
O3 48.6
Air Quality Monitoring Stations Info
Mong Kok AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 37.2 PM2.5 35.5
SO2 6.1 PM10 55.0
O3 43.6
Air Quality Monitoring Stations Info
Tuen Mun AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2 39.0 PM2.5 50.7
SO2 7.7 PM10 94.5
O3 36.7
General Station
Roadside Station
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Last revision date:06:07 09-12-2019