America's Dirtiest Cities
No. 7 Dallas/Fort Worth
According to data, the Dallas area may have less of an ozone problem than Houston, but it still leapfrogged over its fellow Texas city and into the Dirtiest 10 this year. Perhaps voters didn’t find enough green space: the cities ranked last for their public parks. Locals here may prefer ballparks instead—these Texans also ranked in the top 10 for being sports-crazed.