3. Corpus Christi, Texas

As the city furthest south and right next to the Gulf of Mexico, Corpus Christi provides a vast array of water recreation activities and nature tourism. In addition, the city has 2,100 acres of developed and undeveloped park space, including beaches and natural habitats. This all added up to the city reporting a final score of 59.02, a median air quality of 39, 7 parks per 10,000 residents and 6 gallons of excess fuel consumed per commuter.

Texas

2. Anchorage, Alaska

In the complete opposite direction, Anchorage has over 40% of the state's population. Most notably, the city has one of the lowest AQI’s in the country. Anchorage noted a final score of 65.91, a median air quality of 29, 7.8 parks per 10,000 residents and 8 gallons of excess fuel consumed per commuter.

1. Madison, Wis.

The greenest city in U.S. holds the title mostly because it is literally green. It has 12.7 parks per 10,000 residents — the highest mark of all cities in the country. Plus, the city contains more than 15,000 acres of lakes and more than 200 miles of biking and hiking trails. The city won with a final score of 73.52, including a median air quality of 41 and 10 gallons of excess fuel consumed per commuter.