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: January 2019 - December 2019
General Stations
| Station | NO2 | PM10 | PM2.5 |
|---|---|---|---|
| Central/Western | 37 | 30 | 20 |
| Eastern | 38 | 31 | 18 |
| Kwun Tong | 45 | 38 | 21 |
| Sham Shui Po | 48 | 33 | 18 |
| Kwai Chung | 54 | 29 | 18 |
| Tsuen Wan | 46 | 30 | 20 |
| Tseung Kwan O | 29 | 29 | 17 |
| Yuen Long | 44 | 37 | 20 |
| Tuen Mun | 47 | 41 | 24 |
| Tung Chung | 33 | 30 | 19 |
| Tai Po | 36 | 31 | 20 |
| Sha Tin | 32 | 28 | 17 |
| Tap Mun | 10 | 31 | 17 |
Roadside Stations
| Station | NO2 | PM10 | PM2.5 |
|---|---|---|---|
| Causeway Bay | 81 | 43 | 27 |
| Central | 80 | 37 | 24 |
| Mong Kok | 78 | 35 | 24 |
Annual AQI Values
Period: January 2019 - December 2019
General Station
| Station | NO2 | PM10 | PM2.5 |
|---|---|---|---|
| Central/Western | 0.93 | 1.50 | 2.00 |
| Eastern | 0.95 | 1.55 | 1.80 |
| Kwun Tong | 1.13 | 1.90 | 2.10 |
| Sham Shui Po | 1.20 | 1.65 | 1.80 |
| Kwai Chung | 1.35 | 1.45 | 1.80 |
| Tsuen Wan | 1.15 | 1.50 | 2.00 |
| Tseung Kwan O | 0.73 | 1.45 | 1.70 |
| Yuen Long | 1.10 | 1.85 | 2.00 |
| Tuen Mun | 1.18 | 2.05 | 2.40 |
| Tung Chung | 0.83 | 1.50 | 1.90 |
| Tai Po | 0.90 | 1.55 | 2.00 |
| Sha Tin | 0.80 | 1.40 | 1.70 |
| Tap Mun | 0.25 | 1.55 | 1.70 |
Roadside
| Station | NO2 | PM10 | PM2.5 |
|---|---|---|---|
| Causeway Bay | 2.03 | 2.15 | 2.70 |
| Central | 2.00 | 1.85 | 2.40 |
| Mong Kok | 1.95 | 1.75 | 2.40 |
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):
Reference: http://www.who.int/phe/health_topics/outdoorair/outdoorair_aqg/en/index.html
Annual WHO AQG
(μg/m3)
NO2
40
PM10
20
PM2.5
10
For further information about the annual AQI, please visit the FAQ.
