10 Cleanest Countries In The World In 2023

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9. Germany 

Composite Ranking: 9

Air Quality PM2.5 concentration (μg/m³): 11 

Waste Management Score: 69% 

Wastewater Treatment Score: 97% 

Germany demonstrates a remarkable 97% wastewater treatment score that indicates efficient sanitation and pollution control processes. Moreover, the country registers a PM2.5 air quality concentration of 11μg/m³ that underscores successful measures to reduce particulate matter and improve air quality. 

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