10 Cleanest Countries In The World In 2023

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6. Austria 

Composite Ranking: 6

Air Quality PM2.5 concentration (μg/m³): 10.6 

Waste Management Score: 77.4% 

Wastewater Treatment Score: 94% 

Austria has been one of the cleanest countries in the world in 2023 for years. In 2023, the country’s PM2.5 concentration, a critical indicator of air quality, stands at 10.6 μg/m³, compared to the maximum of 2.5 μg/m³ seen in countries with the least airborne pollution issues. Austria’s wastewater treatment infrastructure is also 94%, which contributes to its cleanliness.

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