This small town is mostly famous for a motion picture from 1996 that has the same name and for a similar TV drama series. It’s not getting popular for keeping its air clean, which is mostly possible because of its small population of 114,000. “Coal-fired coal power plants, oil and gas fields, of which the state has plenty, have not been a big problem due to North Dakota’s geography. The windy weather and wide-open spaces dilute the pollution particle.