5 Cleanest Countries in Europe

3. Sweden

Average Wastewater Treatment Level: 78

Average Mismanaged Solid Waste: 95.94

Annual Average PM2.5 Concentration (μg/m³): 6.2

Average Ranking: 7

Sweden ranks in the top 3 of our list with an average rating of 7 and air quality index of 6.2μg/m³. Sweden is a Scandinavian country in Northern Europe with many coastal islands and glacier mountains. Sweden ranks 1st in the wastewater treatment level and has a developed solid waste management system.