Welcome to Environmental Protection Department Air Quality Health Index Website


Central/Western
Date TimeNO2O3SO2COPM10PM2.5
2021-07-31 00:0014.444.24.3-8.94.9
2021-07-30 23:0018.045.44.4-8.86.0
2021-07-30 22:0019.547.25.1-7.15.1
2021-07-30 21:0024.146.08.2-9.06.7
2021-07-30 20:0029.643.85.8-6.14.2
2021-07-30 19:0026.347.85.5-7.35.2
2021-07-30 18:0029.147.85.7-8.65.3
2021-07-30 17:0012.465.04.4-6.42.9
2021-07-30 16:0024.156.35.6-6.94.0
2021-07-30 15:0019.763.35.1-9.97.3
2021-07-30 14:0017.469.04.4-8.67.4
2021-07-30 13:0025.653.73.8-9.77.6
2021-07-30 12:0050.522.77.6-11.87.6
2021-07-30 11:0059.710.55.7-9.95.8
2021-07-30 10:0050.816.04.0-3.73.1
2021-07-30 09:0031.736.76.8-10.48.3
2021-07-30 08:0055.34.010.2-11.87.3
2021-07-30 07:0053.02.514.3-8.86.4
2021-07-30 06:0035.216.26.2-12.87.7
2021-07-30 05:0022.626.13.8-8.84.1
2021-07-30 04:009.340.73.7-6.04.7
2021-07-30 03:0031.428.46.3-7.15.7
2021-07-30 02:0034.728.26.4-9.46.6
2021-07-30 01:0013.657.54.4-11.67.8
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.

(5) Owing to temporary suspension of electricity supply, monitoring at Central roadside air quality monitoring station will be temporarily suspended on 6 August 2021 from 9:30AM to 6:00PM. We apologize for any inconvenience caused.

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Last revision date: 00:07 31-07-2021