1. Honolulu, Hawaii. Honolulu tops the most lists as the cleanest city in the United States. You can expect to feel the sand between your toes without also finding a plastic bag hidden in between, too.

According to the 2026 "State of the Air" and urban cleanliness rankings, Honolulu, Hawaii, consistently ranks as the cleanest major city in the United States. This is largely due to the consistent Pacific trade winds that "scrub" the air of pollutants and the city's limited industrial manufacturing compared to mainland hubs. Honolulu is one of the few large American cities to consistently receive "A" grades from the American Lung Association for having zero high-ozone days. In terms of street-level cleanliness, Anchorage, Alaska, and Bellevue, Washington, also frequently take top spots, cited for their rigorous waste management programs and high levels of environmental consciousness among residents. For small towns, Waimea, Hawaii, currently holds the title for the cleanest air quality in the nation. While "cleanliness" can be subjective, these cities utilize a combination of favorable geography and strict local regulations to maintain pristine environments, making them top choices for retirees and those with respiratory sensitivities who prioritize a high quality of life and healthy surroundings.