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How is the AQHI calculated and reported?

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. aqms.jpg
The map below shows the locations of air quality monitoring stations.

Air Quality Monitoring Stations Info
Central/Western AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2-PM2.515.2
SO2-PM1018.9
O330.1
Air Quality Monitoring Stations Info
Kwai Chung AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO260.7PM2.517.6
SO21.8PM1024.2
O318.4
Air Quality Monitoring Stations Info
Sham Shui Po AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO247.8PM2.516.1
SO22.9PM1018.2
O364.8
Air Quality Monitoring Stations Info
Tai Po AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO227.1PM2.518.4
SO22.6PM1026.6
O340.9
Air Quality Monitoring Stations Info
Tap Mun AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO27.5PM2.59.6
SO21.2PM1012.0
O358.3
Air Quality Monitoring Stations Info
Tsuen Wan AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2-PM2.523.8
SO2-PM1029.4
O3-
Air Quality Monitoring Stations Info
Tung Chung AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2-PM2.526.3
SO2-PM1037.0
O3-
Air Quality Monitoring Stations Info
Yuen Long AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO2-PM2.531.0
SO2-PM1035.8
O3-
Air Quality Monitoring Stations Info
Causeway Bay AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO280.1PM2.519.5
SO21.9PM1027.5
O322.1
Air Quality Monitoring Stations Info
Central AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO283.4PM2.515.9
SO22.3PM1019.3
O327.1
Air Quality Monitoring Stations Info
Sha Tin AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO236.7PM2.515.6
SO21.1PM1025.0
O330.2
Air Quality Monitoring Stations Info
Kwun Tong AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO228.9PM2.511.0
SO20.7PM1015.0
O374.7
Air Quality Monitoring Stations Info
Tseung Kwan O AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO249.7PM2.5-
SO21.9PM10-
O331.7
Air Quality Monitoring Stations Info
Eastern AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO227.1PM2.512.2
SO20.9PM1015.6
O392.3
Air Quality Monitoring Stations Info
Mong Kok AQHI 4
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO267.1PM2.517.8
SO21.8PM1020.1
O353.2
Air Quality Monitoring Stations Info
Tuen Mun AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO274.6PM2.529.8
SO25.6PM1034.1
O36.7
Air Quality Monitoring Stations Info
Southern AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO214.8PM2.511.7
SO20.9PM1024.1
O346.9
Air Quality Monitoring Stations Info
North AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO223.4PM2.5-
SO21.5PM1013.0
O348.1
General Station
Roadside Station
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Last revision date: 13:07 05-05-2024