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: November 2019 - October 2020

General Stations

StationNO2PM10PM2.5
Central/Western332516
SouthernNANANA
Eastern342715
Kwun Tong423216
Sham Shui Po462814
Kwai Chung492415
Tsuen Wan392416
Tseung Kwan O242513
Yuen Long343216
Tuen Mun413420
Tung Chung292414
Tai Po312516
Sha Tin282515
NorthNANANA
Tap Mun92514
Pollutant concentrations in micrograms per cubic metre (μg/m3)

Roadside Stations

StationNO2 PM10PM2.5
Causeway Bay693722
Central693017
Mong Kok753019
Pollutant concentrations in micrograms per cubic metre (μg/m3)

Annual AQI Values
Period: November 2019 - October 2020

General Station

StationNO2PM10PM2.5
Central/Western0.831.251.60
SouthernNANANA
Eastern0.851.351.50
Kwun Tong1.051.601.60
Sham Shui Po1.151.401.40
Kwai Chung1.231.201.50
Tsuen Wan0.981.201.60
Tseung Kwan O0.601.251.30
Yuen Long0.851.601.60
Tuen Mun1.031.702.00
Tung Chung0.731.201.40
Tai Po0.781.251.60
Sha Tin0.701.251.50
NorthNANANA
Tap Mun0.231.251.40
AAQI = 12-month rolling concentrations/Annual WHO AQG concentration

Roadside

StationNO2PM10PM2.5
Causeway Bay1.731.852.20
Central1.731.501.70
Mong Kok1.881.501.90
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: 04:07 26-01-2021