10 Cleanest Countries In The World In 2023

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4. Denmark 

Composite Ranking: 4

Air Quality PM2.5 concentration (μg/m³): 8.6 

Waste Management Score: 68.3% 

Wastewater Treatment Score: 100%  

Denmark sits high on the list of nations with the lowest pollution levels in 2023. Notably, the nation’s PM2.5 concentration is moderate, currently at 8.6 μg/m³, and its wastewater treatment infrastructure has attained a perfect score of 100%.

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