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Latest Annual AQI

The Annual Air Quality Index (AAQI) is the ratio of the past 12-month rolling average concentration to the annual air quality guidelines (AQG) of the World Health Organization (WHO).

Air Pollutant Concentrations (μg/m3)
Period: August 2016 - July 2017

General Stations

StationNO2PM10PM2.5
Central/Western433422
Eastern443120
Kwun Tong483723
Sham Shui Po573423
Kwai Chung583524
Tsuen Wan553122
Tseung Kwan O273018
Yuen Long454023
Tuen Mun484428
Tung Chung363522
Tai Po363122
Sha Tin353020
Tap Mun113420
Pollutant concentrations in micrograms per cubic metre (μg/m3)

Roadside Stations

StationNO2 PM10PM2.5
Causeway Bay944632
Central813220
Mong Kok803827
Pollutant concentrations in micrograms per cubic metre (μg/m3)

Annual AQI Values
Period: August 2016 - July 2017

General Station

StationNO2PM10PM2.5
Central/Western1.081.702.20
Eastern1.101.552.00
Kwun Tong1.201.852.30
Sham Shui Po1.431.702.30
Kwai Chung1.451.752.40
Tsuen Wan1.381.552.20
Tseung Kwan O0.681.501.80
Yuen Long1.132.002.30
Tuen Mun1.202.202.80
Tung Chung0.901.752.20
Tai Po0.901.552.20
Sha Tin0.881.502.00
Tap Mun0.281.702.00
AAQI = 12-month rolling concentrations/Annual WHO AQG concentration

Roadside

StationNO2PM10PM2.5
Causeway Bay2.352.303.20
Central2.031.602.00
Mong Kok2.001.902.70
AAQI = 12-month rolling concentrations/Annual WHO AQG concentration

Remarks:

(1) NO2 - nitrogen dioxide, PM10 - respirable suspended particulates, PM2.5 - fine suspended particulates

(2) The AAQI is updated monthly. The AAQI is calculated based on validated monitoring data.

(3) An AAQI greater than one indicates that the health risk resulted from long-term exposure is higher than that of the WHO's annual AQG, whereas an index below one means a lower risk.

(4) WHO’s annual AQG (2006):

Annual WHO AQG
(μg/m3)
NO2 40
PM10 20
PM2.5 10

Reference: http://www.who.int/phe/health_topics/outdoorair/outdoorair_aqg/en/index.html

For further information about the annual AQI, please visit the FAQ.

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Last revision date:01:06 23-11-2017