EPA says company had not sufficiently reduced sulfur emissions at four refineries . The facilities in question are in Louisiana , Texas and Louisiana . -- Federal officials have fined Exxon Mobil more than $ 6 million after it violated a three-year-old agreement to decrease air pollution at four of its refineries . EPA says refineries now meet Exxon Mobil standards on sulfur emissions .
EPA says company had not sufficiently reduced sulfur emissions at four refineries . The facilities in question are in Louisiana , Texas and Louisiana . EPA says refineries now meet Exxon Mobil standards on sulfur emissions .