Welcome to Environmental Protection Department Air Quality Health Index Website


Tsuen Wan
Date TimeNO2O3SO2COPM10PM2.5
2024-05-05 11:0049.972.61.9350.710.17.4
2024-05-05 10:0029.280.81.1337.77.85.9
2024-05-05 09:0029.463.30.9363.37.35.6
2024-05-05 08:0027.658.70.9351.98.77.1
2024-05-05 07:0031.052.70.8386.010.17.2
2024-05-05 06:0018.554.50.9259.211.46.7
2024-05-05 05:0022.546.30.8273.210.56.6
2024-05-05 04:0026.545.70.9377.610.46.6
2024-05-05 03:0028.850.70.8376.59.45.4
2024-05-05 02:0025.953.20.8339.28.03.7
2024-05-05 01:0032.053.00.8355.310.46.2
2024-05-05 00:0034.156.80.7342.37.94.8
2024-05-04 23:0037.263.70.8352.310.99.1
2024-05-04 22:0040.974.30.9394.96.24.9
2024-05-04 21:0072.754.81.0510.33.72.9
2024-05-04 20:0066.170.80.8426.411.09.9
2024-05-04 19:0066.469.61.0433.58.06.6
2024-05-04 18:0049.472.81.0491.47.85.3
2024-05-04 17:0054.759.30.8465.15.32.2
2024-05-04 16:0047.173.50.8420.511.49.6
2024-05-04 15:0040.379.00.9513.310.89.7
2024-05-04 14:0055.363.31.1600.78.07.3
2024-05-04 13:0047.975.20.8671.44.74.5
2024-05-04 12:0042.479.40.6700.83.12.8
Remarks:

(1) Time shown is in Hong Kong time.

(2) Concentration shown is in microgram per cubic metre (µg/m3).

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

(4) The pollutant concentration is based on real time data taken directly from EPD's Air Quality Monitoring Network.

Last revision date: 11:07 05-05-2024