A suit was filed in the U.S. District Court for the District of North Dakota by four states on September 12 against the Environmental Protection Agency for failing to meet a statutory deadline to designate nonattainment areas for sulfur dioxide. North Dakota, Nevada, South Dakota, and Texas alleged that the failure has prevented the states from making Clean Air Act permit decisions. The agency had designated 29 areas on August 5 but said it is waiting for more data before making additional designations.