Welcome to Environmental Protection Department Air Quality Health Index Website

(At 2021-07-30 23:00)


(1) Time shown is in Hong Kong time.

(2) The AQHI information is based on real time data taken directly from EPD's Air Quality Monitoring Network.

(3) The total percentage may not be equal to 100% due to rounding.

(4) SO2 - sulphur dioxide, NO2 - nitrogen dioxide, O3 - ozone,
PM – respirable suspended particulates (PM10) or fine suspended particulates (PM2.5), whichever poses a higher health risk.

(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: 23:07 30-07-2021