The 30 Cleanest Cities in the World

Honolulu, Hawaii, USA

With a population of almost 340,000 people, Honolulu is the most remote major city in the world as the closest location on the mainland to it is the Point Arena Lighthouse in California at 3,800 km (2,360 mi). It might be due this extreme isolation that Honolulu (as well as the whole state of Hawaii) is one of the cleanest and greenest places in the world.