Home › Forums › Sulfur › News › CHS Laurel/Billings Refinery SO2 release › RE: CHS Laurel/Billings Refinery SO2 release August 24, 2011 at 9:28 pm #4962 Charles RandallParticipant Seems to be lot sulfur release going on at coking refineries like the SO2 @ CHS Laurel Refinery & H2S @ BP Whiting Refinery.Regards