1. Kyoto, Japan
Although Japan’s metropolitan capital didn’t make the list, the country’s cultural capital, Kyoto, has long been a global leader in clean air initiatives.
Home to the Kyoto Protocol, the city is a tranquil destination where you can spend days exploring the tallest wooden pagoda in Japan, traditional bath houses and manicured Japanese gardens—not to mention the cherry blossoms in Spring which should be on every traveller’s radar.
(Related: A Slow Travel Guide To Kyoto, Japan)