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: February 2021 - January 2022

General Stations

StationNO2PM10PM2.5
Central/Western322515
Southern292512
Eastern352714
Kwun Tong472916
Sham Shui Po462714
Kwai Chung502516
Tsuen Wan432315
Tseung Kwan O252313
Yuen Long392817
Tuen Mun433419
Tung Chung262517
Tai Po312415
Sha Tin302414
North352414
Tap Mun92213
Pollutant concentrations in micrograms per cubic metre (μg/m3)

Roadside Stations

StationNO2 PM10PM2.5
Causeway Bay703823
Central662918
Mong Kok692918
Pollutant concentrations in micrograms per cubic metre (μg/m3)

Annual AQI Values
Period: February 2021 - January 2022

General Station

StationNO2PM10PM2.5
Central/Western0.801.251.50
Southern0.731.251.20
Eastern0.881.351.40
Kwun Tong1.181.451.60
Sham Shui Po1.151.351.40
Kwai Chung1.251.251.60
Tsuen Wan1.081.151.50
Tseung Kwan O0.631.151.30
Yuen Long0.981.401.70
Tuen Mun1.081.701.90
Tung Chung0.651.251.70
Tai Po0.781.201.50
Sha Tin0.751.201.40
North0.881.201.40
Tap Mun0.231.101.30
AAQI = 12-month rolling concentrations/Annual WHO AQG concentration

Roadside

StationNO2PM10PM2.5
Causeway Bay1.751.902.30
Central1.651.451.80
Mong Kok1.731.451.80
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

Mobile Version | Desktop Version
Last revision date: 22:07 26-05-2022