1. Lake Havasu City, Arizona
The EPA ranks the air quality in Lake Havasu City at 90 on a scale of 100, which is terrific because the greater the number, the better. This number is based upon ozone alert days and the number of pollutants found in the air, all based upon EPA reports. This is excellent news for those who come here to retire, hike the beautiful environments, or delight in year-round sunlight.