In the United States, only one city fits the bill: Honolulu, Hawaii. Yes, if you're trying to go to one of the 10 cleanest cities in the world and don't want to travel outside the U.S., Hawaii is ...

The United States tops the WHO's list as the country with the most cities with clean air with a whopping 274, though to be fair, 69 of those were cities with 10 µg/m3 — right at the cutoff point.

Cities are increasingly turning to clean energy jobs to boost their economies and keep electricity bills low. In the United States, 50 metropolitan areas account for half of all clean energy jobs ...

Only two cities made it onto one list: Top 25 cleanest U.S. Cities by year-round particle pollution. In terms of the cleanest cities, Colorado did not rank very high. Only two cities made it onto ...