Clean Air Facility Program
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Hong Kong air quality index (AQI)
Last updated at 07:00, September 4
41Good
US AQI⁺
PM2.5 | 7.4 µg/m³
30°
63%
13.8 km/hThursday53
28°31°
Friday56
28°30°
Saturday62
27°30°
Live city ranking
Cities with high air pollution (AQI⁺)
This hourly ranking includes 10 global cities with measured PM2.5 data. Click to learn more.
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News
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September 3, 2025: Riyadh among the most polluted cities in the world
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