Welcome to Environmental Protection Department Air Quality Health Index Website


Yuen Long
Date TimeNO2O3SO2COPM10PM2.5
2023-06-05 11:0018.940.94.2512.410.34.9
2023-06-05 10:0020.331.64.1508.611.46.9
2023-06-05 09:0024.222.34.1564.410.18.1
2023-06-05 08:0030.516.54.0621.07.47.2
2023-06-05 07:0023.721.24.0526.06.24.7
2023-06-05 06:0013.229.53.8442.610.77.5
2023-06-05 05:009.733.03.8458.010.06.7
2023-06-05 04:0010.134.54.0433.29.15.7
2023-06-05 03:009.637.94.1452.411.78.2
2023-06-05 02:00----11.28.0
2023-06-05 01:00----10.37.1
2023-06-05 00:0016.932.33.8495.49.76.8
2023-06-04 23:0019.233.03.7533.69.56.6
2023-06-04 22:0019.434.83.7526.19.27.0
2023-06-04 21:0017.738.43.7537.910.78.2
2023-06-04 20:0017.542.93.9525.49.87.3
2023-06-04 19:0024.039.23.9535.28.65.9
2023-06-04 18:0021.243.63.7536.07.54.8
2023-06-04 17:0015.152.64.0489.99.87.0
2023-06-04 16:0014.056.94.0482.27.44.8
2023-06-04 15:0014.161.63.8522.39.36.4
2023-06-04 14:0020.362.44.2538.911.27.8
2023-06-04 13:0022.653.04.4557.613.411.3
2023-06-04 12:0024.046.73.9572.810.27.6
Remarks:

(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 is based on real time data taken directly from EPD's Air Quality Monitoring Network.

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Last revision date: 11:07 05-06-2023