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IQAir -  Seattle currently ranked internationally #1 in polluted air quality, August 20, 2023

Dashboard
Live rankings
Most polluted cities
Live most polluted major city ranking 
17:21 (local time)
AQI US legend

151-200
[Seattle 188]
Unhealthy

Hazardous
Rank 	Major city,     country/region  AQI US	
1 	Seattle, USA	Seattle, USA    188

https://www.iqair.com/us/world-air-quality-ranking