Hong Kong air quality index (AQI)
Last updated at 06:00, September 4
US AQI⁺
PM2.5 | 8 µg/m³
30°
63%
13.8 km/h
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Live city ranking
Cities with high air pollution (AQI⁺)
News
September 4, 2025: Baghdad among the most polluted cities in the world
Baghdad is currently enduring severely unhealthy air quality, AQI around 150, ranking as the second most polluted city globally. Learn what’s fueling the smog and what to expect.
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Find out more about air quality in Addis Ababa, Ethiopia. Learn what’s driving pollution and when conditions may improve
September 3, 2025: Karachi among the most polluted cities in the world
Karachi currently suffers from very poor air quality, AQI over 100, making it the most polluted major city globally. See what’s causing the haze and when air quality might improve.
September 3, 2025: Riyadh among the most polluted cities in the world
Riyadh currently faces poor air quality, AQI over 100, making it one of the world’s most polluted cities. Learn what’s driving the haze and what you can do to stay safe.
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