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15 Cities with the Cleanest Air in the World

15. Singapore

PM 2.5 annual mean, ug/m3: 18

Singapore is the best example of a country which reached the very top of the list of cleanest countries in the world by legislation. Fines for throwing litter go up to $5,000 and the offender might be asked to wear a sign that reads: “I am a litter lout.” Although this country aims at reducing pollution to a minimum, occasional rise in air pollution places it at the bottom of our list of 15 cities with the cleanest air in the world.

15 Cities with the Cleanest Air in the World

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