Welcome to Environmental Protection Department Air Quality Health Index Website

(At 2021-05-09 17:00)

Added Health Risk
Contribution by each pollutant on the added health risk (percentage)
4.89 0.050 (1%) 2.370 (48%) 1.872 (38%) 0.599 (12%)

(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, PM10 and PM2.5 monitoring at Causeway Bay roadside air quality monitoring station will be temporarily suspended starting from 10:00 AM, 12 May 2021 until further notice. We apologize for any inconvenience caused.

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Last revision date: 17:07 09-05-2021