Worst air pollution Hong Kong, today and tomorrow
Today (10 August): Air quality in Hong Kong is very poor. AQI and O3 are very poor; NO2 is poor; PM2.5 and SO2 are fair; PM1 is medium; PM10, CO, and HCHO are good. Pollution peaks around 1:00 PM (O3: 100/100).
Tomorrow (11 August 2026): Air quality in Hong Kong is very poor. NO2 decreases to medium; PM1 increases to fair; all other pollutants stay as today. Pollution peaks around 3:00 PM (O3: 100/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Hong Kong's air quality reflects the densely urbanised Kowloon Peninsula position adjacent to the former Kai Tak Airport site, with vehicle traffic on the surrounding Lung Cheung Road corridor and the concentrated urban commercial and residential character contributing elevated NOₓ. The harbour's limited waterway ventilation provides some maritime influence, while transboundary Pearl River Delta industrial pollution on northerly winds consistently elevates regional background PM2.5 throughout the year.
Today - 10 August | Pollution peaks at 13:00
AQI:
Very poor
100/100
PM2.5 (fine particles):
Fair
34.2/100
PM10 (coarse particles):
Good
9.8/100
NO2 (nitrogen dioxide):
Poor
62.4/100
O3 (ozone):
Very poor
100/100
SO2 (sulfur dioxide):
Fair
25.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
16.2/100
PM1 (ultrafine particles):
Medium
40.6/100
Levels show the poorest local air quality during the day
Tomorrow - 11 August | Pollution peaks at 15:00
AQI:
Very poor
100/100
PM2.5 (fine particles):
Fair
28.5/100
PM10 (coarse particles):
Good
8.1/100
NO2 (nitrogen dioxide):
Medium
48.3/100
O3 (ozone):
Very poor
100/100
SO2 (sulfur dioxide):
Fair
34.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
16.4/100
PM1 (ultrafine particles):
Fair
35.8/100
Frequently Asked Questions
Is air quality bad in Hong Kong right now?
On 10 August 2026, overall air quality in Hong Kong is very poor. AQI is the main air quality indicator at 100/100. Pollution peaks around 1:00 PM (O3: 100/100).
Will air quality be worse tomorrow in Hong Kong?
On 11 August 2026, air quality conditions in Hong Kong will be similar to today, with AQI forecast at very poor at 100/100. Pollution peaks around 3:00 PM (O3: 100/100).
When is air pollution at its worst in Hong Kong?
Hong Kong usually sees its poorest air quality when traffic emissions, aircraft operations at the local air base, along with fishing fleet activity coincide with periods when windblown dust events occur. These wind events can carry dust in from the surrounding arid landscape. Onshore breezes usually help clear the air, but pollution can build up when winds are light.
Are air quality levels in Hong Kong based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 9 August 2026 at 20:27 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
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