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: June 2020 - May 2021

General Stations

StationNO2PM10PM2.5
Central/Western322716
SouthernNANANA
Eastern342915
Kwun Tong463417
Sham Shui Po452914
Kwai Chung512615
Tsuen Wan392516
Tseung Kwan O242413
Yuen Long333116
Tuen Mun413720
Tung Chung262715
Tai Po312616
Sha Tin302714
NorthNANANA
Tap Mun92614
Pollutant concentrations in micrograms per cubic metre (μg/m3)

Roadside Stations

StationNO2 PM10PM2.5
Causeway Bay703923
Central673118
Mong Kok703019
Pollutant concentrations in micrograms per cubic metre (μg/m3)

Annual AQI Values
Period: June 2020 - May 2021

General Station

StationNO2PM10PM2.5
Central/Western0.801.351.60
SouthernNANANA
Eastern0.851.451.50
Kwun Tong1.151.701.70
Sham Shui Po1.131.451.40
Kwai Chung1.281.301.50
Tsuen Wan0.981.251.60
Tseung Kwan O0.601.201.30
Yuen Long0.831.551.60
Tuen Mun1.031.852.00
Tung Chung0.651.351.50
Tai Po0.781.301.60
Sha Tin0.751.351.40
NorthNANANA
Tap Mun0.231.301.40
AAQI = 12-month rolling concentrations/Annual WHO AQG concentration

Roadside

StationNO2PM10PM2.5
Causeway Bay1.751.952.30
Central1.681.551.80
Mong Kok1.751.501.90
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: 22:07 21-09-2021