Welcome to Environmental Protection Department Air Quality Health Index Website


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: October 2022 - September 2023

General Stations

StationNO2PM10PM2.5
Central/Western312114
Southern252512
Eastern322313
Kwun Tong412514
Sham Shui Po422311
Kwai Chung462415
Tsuen Wan392315
Tseung Kwan O212415
Yuen Long372415
Tuen Mun383317
Tung Chung252213
Tai Po272315
Sha Tin272112
North302515
Tap Mun82212
Pollutant concentrations in micrograms per cubic metre (μg/m3)

Roadside Stations

StationNO2 PM10PM2.5
Causeway Bay663722
Central632718
Mong Kok662817
Pollutant concentrations in micrograms per cubic metre (μg/m3)

Annual AQI Values
Period: October 2022 - September 2023

General Station

StationNO2PM10PM2.5
Central/Western0.781.051.40
Southern0.631.251.20
Eastern0.801.151.30
Kwun Tong1.031.251.40
Sham Shui Po1.051.151.10
Kwai Chung1.151.201.50
Tsuen Wan0.981.151.50
Tseung Kwan O0.531.201.50
Yuen Long0.931.201.50
Tuen Mun0.951.651.70
Tung Chung0.631.101.30
Tai Po0.681.151.50
Sha Tin0.681.051.20
North0.751.251.50
Tap Mun0.201.101.20
AAQI = 12-month rolling concentrations/Annual WHO AQG concentration

Roadside

StationNO2PM10PM2.5
Causeway Bay1.651.852.20
Central1.581.351.80
Mong Kok1.651.401.70
AAQI = 12-month rolling concentrations/Annual WHO AQG concentration

Remarks:

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

(2) 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.

(3) 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.

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

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Last revision date: 01:07 28-02-2024