10 Cleanest Countries In The World In 2023

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7. Norway 

Composite Ranking: 7

Air Quality PM2.5 concentration (μg/m³): 7 

Waste Management Score: 70.7% 

Wastewater Treatment Score: 64.3% 

Norway is considered one of the cleanest countries in 2023 due to its remarkable air quality. This status is predominantly attributable to its PM2.5 concentration averaging at 7 µg/m³, slightly higher than the global standard of 2.5 µg/m³.

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