The Iowa Department of Natural Resources has reached an agreement with twoMason City Cement Plants to help them reduce air quality violations. AirQuality Specialist Brian Button says the plan will help reduce the dust inthe air that comes from the plants.D-N-R air quality Bureau Chief Pete Hamlin says the rules will allow thecity to stay within E-P-A guidelines for emmissions.The plans must still be approved by the state environmental protectioncommission.