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 ...

A new 200-city ranking reveals which large US cities are clean and which ones are filthy. The data used for the rankings comes from a variety of sources and should paint a fairly accurate picture ...

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 ...