Welcome to Environmental Protection Department Air Quality Health Index Website


Tsuen Wan
Date TimeNO2O3SO2COPM10PM2.5
2021-06-21 06:0025.148.23.4758.321.811.1
2021-06-21 05:0019.050.13.3736.124.012.5
2021-06-21 04:0012.252.53.2739.424.613.6
2021-06-21 03:0011.453.33.2718.625.914.9
2021-06-21 02:0015.646.95.9723.624.612.9
2021-06-21 01:00----24.012.2
2021-06-21 00:0034.138.63.1780.626.115.3
2021-06-20 23:0029.248.43.2786.024.013.3
2021-06-20 22:0031.141.73.2828.422.311.4
2021-06-20 21:0031.039.43.2852.621.411.0
2021-06-20 20:0035.537.93.2849.922.413.2
2021-06-20 19:0035.837.93.7840.620.410.8
2021-06-20 18:0043.734.63.4845.422.712.7
2021-06-20 17:0039.644.63.3841.324.214.2
2021-06-20 16:0036.758.33.2843.927.416.4
2021-06-20 15:0041.756.73.3861.327.316.4
2021-06-20 14:0039.157.83.8857.425.615.2
2021-06-20 13:0038.752.94.4840.120.210.9
2021-06-20 12:0031.554.14.1789.818.59.8
2021-06-20 11:0034.550.14.3803.319.510.5
2021-06-20 10:0032.445.74.0776.317.28.9
2021-06-20 09:0032.938.03.3779.620.112.0
2021-06-20 08:0033.437.73.7773.219.411.4
2021-06-20 07:0039.332.43.5748.619.811.5
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: 06:07 21-06-2021