10 Cleanest Countries In The World In 2023

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3. Australia 

Composite Ranking: 3

Air Quality PM2.5 concentration (μg/m³): 4.2 

Waste Management Score: 69% 

Wastewater Treatment Score: 92.9% 

Australia will be the third cleanest country in the world in 2023 because of its commendable air quality, characterized by a PM2.5 concentration of just 4.2 μg/m³. When coupled with a wastewater treatment infrastructure operating at 92.9% efficacy, it’s no doubt the nation ranks so high. 

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