Federal officials threatened Monday to block road money and seize control of Utah's air quality management plan because of an exemption for excessive pollution from oil refineries and other sources. Utah officials have about 18 months to change the rule to ensure polluters are cited for a violation first, instead of the state having to investigate a breakdown and then issue a violation, said Monica Morales, the head of the air quality planning unit for the Environmental Protection Agency's Region 8 office in Denver. The current rule "is not in compliance with the Clean Air Act," Morales said.