Measurement of Sulfur-Dioxide Emissions from Ocean-Going Vessels in Belgium Using Novel Techniques

• Published in: Atmosphere Vol. 13; no. 11; p. 1756
• Main Authors: Van Roy, Ward, Van Nieuwenhove, Annelore, Scheldeman, Kobe, Van Roozendael, Benjamin, Schallier, Ronny, Mellqvist, Johan, Maes, Frank
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.11.2022
• Subjects: Air pollution; airborne compliance monitoring; Aircraft; Climate change; Coastguard services; Compliance; Data analysis; Emission analysis; Emission measurements; Emission standards; Emissions; Emissions (Pollution); Environmental aspects; Global positioning systems; GPS; Health problems; Hydrocarbons; Marine pollution; MARPOL Annex VI; Measurement; Nitrogen compounds; Oceans; Organic compounds; Oxides; Pollutants; Pollution control equipment; Ports; Regulation; Scrubbers; SECA; Sensors; Shipping industry; Sulfur; Sulfur content; Sulfur dioxide; Sulphur; Surveillance; Uncertainty; VOCs; Volatile organic compounds; Belgium; Sweden; North Sea
• ISSN: 2073-4433; 2073-4433
• DOI: 10.3390/atmos13111756

Air pollutants emitted by ocean-going vessels (OGVs) cause numerous environmental and human health problems. In 2016, the Belgian Coastguard aircraft was equipped with a sniffer sensor to monitor compliance with MARPOL Annex VI Regulation 14. However, the sensor was susceptible to NO and Volatile Organic Compounds (VOCs), which had a negative impact on the measurement uncertainty. The elimination of measurement errors was achieved by modifying the sensor, including among others the addition of a NOx sensor and a custom-designed hydrocarbon kicker. This resulted in a substantial improvement in the measurement quality and uncertainty of the derived Fuel Sulfur Content (FSC). As a direct result of this, the reporting thresholds for non-compliance drastically improved. The data analysis of sampled OGVs showed that compliance levels notably improved between 2019 and 2020 (from 95.9% to 97.3%), coinciding with the implementation of the Global Sulfur Cap. Findings in this study have also demonstrated that OGVs equipped with emission abatement technology (scrubbers) are more susceptible to non-compliance with Regulation 14 of MARPOL Annex VI. Given these results, this article provides an answer to the question of how to monitor effective implementation of NO emissions from OGVs.