In 2023, only seven countries met the World Health Organization's air pollution guidelines: Australia, Estonia, Finland, Grenada, Iceland, Mauritius, and New Zealand.
US cities with the least air pollution were Minneapolis, Houston, and Chicago, ranking within the world's top 10 cleanest cities, while Washington DC, Detroit, and New York had the worst air quality.
The Air Quality Index (AQI) measures overall air quality on a scale from 0 to 500; lower numbers indicate cleaner air, while an AQI above 300 is hazardous.
The cities with the cleanest air have managed to decrease air pollution by regulating emissions, investing in public transportation, and transitioning to clean energy.
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