Welcome to Environmental Protection Department Air Quality Health Index Website

(At 2023-09-24 17:00)

General Stations
Pollutant Concentrations(μg/m3)
Station NamesNO2O3SO2COPM10PM2.5AQHI
Kwun Tong25.675.4519.910.74
Sham Shui Po28.255.33.313.27.63
Kwai Chung2061.3512.57.63
Tsuen Wan29.750.64.8604.210.77.43
Tseung Kwan O5.999.8167.219.110.54
Yuen Long18.8205.760811.67.82
Tuen Mun10.969.12.4278.813.95.13
Tung Chung8.958.86.4334.87.94.73
Tai Po10.675.52.614.410.53
Sha Tin3.579.62.511.35.63
Tap Mun51072482.41884

Roadside Stations
Pollutant Concentrations(μg/m3)
Station NamesNO2O3SO2COPM10PM2.5AQHI
Causeway Bay49.948.53.1339.731.618.64
Mong Kok57.937.24.8742.517.79.53


(1) Time shown is in Hong Kong time.

(2) NO2 - nitrogen dioxide, O3 - ozone,
     SO2 - sulphur dioxide, CO - carbon monoxide,
     PM10 - respirable suspended particulates,
     PM2.5 - fine suspended particulates

(3) Concentration shown is in µg/m3.

(4) The Pollutant concentration and AQHI information are based on real time data taken directly from EPD's Air Quality Monitoring Network.

(5) In case of equipment or station suspension due to repair and maintenance, the data collection for calculation of AQHI at station will be affected, the data of similar stations will then be adopted. Such AQHI will be shown with an asterisk.

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Last revision date: 17:07 24-09-2023