This dataset is composed of the following sources: Ward Van Roy (n.d.). Reanalysed ship emission measurements.

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To calculate the FSC, the SO2 emission factor in g SO2/kg fuel was calculated based on the SO2 and CO2 concentration before and in the plume. When passing through the plume, the increased SO2 and CO2 compared to the background (bkg) was calculated by looking at the surface area under the respective concentration plots. To calculate the amount of kg burned fuel the amount of C was multiplied with the carbon content in the fuel, for marine fuels a carbon content of 87% was used. The NOx emission factor (EFNOx) in g NOx/kg fuel can be calculated by looking at the NOx and CO2 concentration. When hitting the exhaust plume, the increased NOx and CO2 compared to the background (bkg) are derived by looking at the surface area under the respective concentration plots. A list, which is updated every year, with all Keel Laying Years (KLYs) and MMSI numbers of 49327 OGVs larger than 70 m was obtained from GISIS and EMSA. For the initial NOx emission calculation, an SFC of 0.2 was used. When these initial calculation showed a value exceeding a predefined threshold, marine VHF radio contact was made with the vessel to request the actual fuel consumption (in metric tons/hour) and main engine power output, to be calculated and provided by the chief engineer. It was chosen to ask the total main engine power output as the provision of the crankshaft power output may not always be possible, reliable or as fast as the main engine total power output. The total power output will always be slightly higher than the crankshaft power due to friction losses and losses for auxiliary systems. Therefore it is assumed that the obtained NOx emission is an underestimation of the actual NOx emission. Based on the information obtained through radio communication, the SFC was calculated (for suspicious NOx measurements only).The sniffer sensor consists of a set of different sensors and equipment mounted in a 19” housing. The sampling units consist of a stainless-steel sampling tube (3/8”) on the bottom of the aircraft; a particle filter (1µm); a powerful vacuum pump (KNF); pressure and flow regulators; an Automatic Identification System (AIS) antenna; a Global Positioning System (GPS) antenna and an Aeronautical Radio INC. (ARINC) module. The ARINC module is connected to the Flight Management System (FMS) of the aircraft avionics suite (i.e. Garmin GNS600 and GTN650)The sniffer sensor consists of a set of different sensors and equipment mounted in a 19” housing. The analysis units are a Thermo Trace Level Ultraviolet fluorescence sensor, used for the measurement of SO2 in ppb (unitless); a Bioscience Licor Nondispersive Infrared NDIR sensor, used for the measurement of CO2 in ppm (unitless); an Ecotech Serinus 40, used for the measurement of NOx/NO in ppb (unitless); a zatoc mini log computer; a combined Automatic Identification System (AIS) and Global Positioning System (GPS) receiver.

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ISO 19115:2003/19139