Chattanooga has been ranked as one of the top 15 metro areas seeing the most improvement in air quality.
The Scenic City ranks 12th on the list. The number of good air quality days here improved 50 percent between 2010 and 2014. Sixty-six percent of days had good air quality in 2014.
The list is based on the biggest gains in the percentage of good days for air quality. It comes from data compiled by the SelfStorage.com Moving Blog.
St. Louis, Mo., ranked first on the list. One other Tennessee city, Memphis, ranked seventh.
The complete list can be found here.