Welcome to Environmental Protection Department Air Quality Health Index Website


Yuen Long
Date TimeNO2O3SO2COPM10PM2.5
2023-05-30 01:00----26.415.1
2023-05-30 00:0050.242.36.8674.126.114.3
2023-05-29 23:0051.157.36.5712.831.318.2
2023-05-29 22:0048.983.46.6704.434.518.7
2023-05-29 21:0047.3107.66.8665.636.118.3
2023-05-29 20:0061.2110.46.3669.840.119.6
2023-05-29 19:0069.6152.98.3690.251.725.3
2023-05-29 18:0059.5188.59.3689.252.225.5
2023-05-29 17:0062.9188.17.4646.650.523.0
2023-05-29 16:0043.0185.96.8589.944.220.0
2023-05-29 15:0041.2152.56.7590.136.017.6
2023-05-29 14:0036.9112.86.7572.331.414.3
2023-05-29 13:0037.091.37.4569.032.812.5
2023-05-29 12:0046.567.08.5604.832.814.1
2023-05-29 11:0049.551.28.4580.628.512.0
2023-05-29 10:0047.943.68.5598.525.611.7
2023-05-29 09:0038.847.06.9580.023.911.9
2023-05-29 08:0048.733.86.2660.324.113.0
2023-05-29 07:0046.928.65.5681.921.511.8
2023-05-29 06:0040.022.55.4639.621.812.8
2023-05-29 05:0032.430.15.8632.722.711.1
2023-05-29 04:0049.626.26.6598.927.712.6
2023-05-29 03:0048.526.45.9579.321.811.7
2023-05-29 02:0053.211.15.6708.323.212.6
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: 01:07 30-05-2023