Welcome to Environmental Protection Department Air Quality Health Index Website

(At 2023-06-05 11:00)

General Stations
Pollutant Concentrations(μg/m3)
Station NamesNO2O3SO2COPM10PM2.5AQHI
Kwun Tong36.122.14.918.48.82
Sham Shui Po33.532.
Kwai Chung32.332.34.1168.62
Tsuen Wan23.934.52.7666.913.67.12
Tseung Kwan O-52.8--13.57.22
Yuen Long18.940.94.2512.410.34.92
Tuen Mun2529.31.6485.420.34.22
Tung Chung7.141.83.2441.813.37.62
Tai Po9.
Sha Tin5.949.81.912.35.32
Tap Mun0.960.84.1442.617.56.52

Roadside Stations
Pollutant Concentrations(μg/m3)
Station NamesNO2O3SO2COPM10PM2.5AQHI
Causeway Bay47.625.52.4459.326.4143
Mong Kok6110.75671.919.89.62


(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: 11:07 05-06-2023