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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)
NO239.5PM2.5-
SO23.6PM10-
O343.9
Air Quality Monitoring Stations Info
Kwai Chung AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO241.4PM2.515.3
SO25.0PM1019.7
O326.5
Air Quality Monitoring Stations Info
Sham Shui Po AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO250.0PM2.5-
SO23.6PM10-
O335.4
Air Quality Monitoring Stations Info
Tai Po AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO221.4PM2.59.2
SO20.8PM1010.7
O343.0
Air Quality Monitoring Stations Info
Tap Mun AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO27.6PM2.514.1
SO24.1PM1017.7
O356.4
Air Quality Monitoring Stations Info
Tsuen Wan AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO237.3PM2.520.2
SO28.9PM1033.1
O329.3
Air Quality Monitoring Stations Info
Tung Chung AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO256.7PM2.528.9
SO215.6PM1036.9
O311.8
Air Quality Monitoring Stations Info
Yuen Long AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO230.5PM2.513.1
SO23.7PM1016.2
O337.8
Air Quality Monitoring Stations Info
Causeway Bay AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO273.7PM2.522.0
SO26.3PM1034.4
O318.2
Air Quality Monitoring Stations Info
Central AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO257.8PM2.5-
SO21.6PM10-
O327.4
Air Quality Monitoring Stations Info
Sha Tin AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO223.8PM2.58.1
SO24.5PM1011.6
O345.5
Air Quality Monitoring Stations Info
Kwun Tong AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO243.4PM2.514.6
SO24.0PM1021.1
O333.6
Air Quality Monitoring Stations Info
Tseung Kwan O AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO213.4PM2.5-
SO21.2PM1013.1
O364.4
Air Quality Monitoring Stations Info
Eastern AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO240.1PM2.514.6
SO20.6PM1019.7
O356.9
Air Quality Monitoring Stations Info
Mong Kok AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO283.9PM2.520.5
SO23.8PM1027.8
O3-
Air Quality Monitoring Stations Info
Tuen Mun AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO249.6PM2.515.0
SO24.1PM1036.0
O325.6
Air Quality Monitoring Stations Info
Southern AQHI 3
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO222.2PM2.59.9
SO24.0PM1016.7
O361.0
Air Quality Monitoring Stations Info
North AQHI 2
Past 24 hrsConcentration / AQHI
Hourly concentration (ug/m3)
NO217.2PM2.57.5
SO21.0PM1012.7
O347.8
General Station
Roadside Station
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Last revision date: 16:07 06-02-2023