In 2016 our coast guard partner MUMM/ Operational Directorate Natural Environment - Royal Belgian Institute of Natural Sciences flew a total of 273 hours on missions to observe the North Sea from the air. The operators detected 33 instances of pollution caused by vessels at sea: 13 operational discharges and 20 accidental discharges. They also investigated sulphur emissions at sea: 120 vessels were suspected of emitting high levels of sulphur from their exhausts.