The Role of the Belgian Airborne Sniffer Measurements in the MARPOL Annex VI Enforcement Chain

Abstract

Responding to an urgent call for effective and cost-efficient enforcement of emission regulations from ocean-going vessels (OGVs) at sea, the Royal Belgian Institute of Natural Sciences, one of the 17 official partners of the Belgian coastguard structure, launched its airborne sniffer program in 2015. A custom-built sniffer sensor was installed on board of the Belgian coastguard aircraft and has been used for the in-situ measurement of SO2 and NOx in OGV exhausts, providing non-compliance alerts to port inspection authorities in Belgium and other EU member states. To guarantee the consistency in quality and reliability of the airborne non-compliance alerts, the standard operational procedures and measurement methodology have been described and recorded in a sniffer quality management system (SQMS). As part of the SQMS, alerting thresholds for non-compliance with SO2 and NOx standards were defined based on the emission limits and the measurement uncertainty. In addition, compliant measurements for the fuel sulfur content (FSC) were shared through Thetis-EU, which is the sulfur inspection database hosted by the European Maritime Safety Agency (EMSA). By providing both non-compliance alerts and compliant measurements to port inspection authorities, the coastguard aircraft fulfills a first-step in the enforcement chain. This article demonstrates that the reported alerts have not only led to several sanctions, but the analysis also showed that the provision of airborne alerts improved the efficiency of the port inspection authorities drastically, resulting in a cost-efficient improvement of their enforcement strategy. Port inspection authorities were able to follow-up on 46% of the generated FSC alerts. In addition, 43% of the alerted OGVs, which were followed up, were confirmed as non-compliant after a port inspection. Accordingly, conditions were in place to effectively sanction 20% of the non-compliant observations. For NOx alerts, a limited follow-up was done by port inspection authorities and none of the alerts were confirmed by those inspections, which is mainly due to the lack of suitable inspection mechanisms and the absence of additional EU implementation regulations on NOx emission inspections. Aiming at paving the way for a stricter enforcement of airborne non-compliance alerts, a validation analysis was done between the airborne FSC measurements and reference FSC measurements. In addition to onboard measurements from exhaust gas cleaning systems (EGCS), analyzes of fuel samples were also carried out by port inspection authorities in order to acquire reference measurements. The validation analysis presented in this study showed that the empiric deviation of the airborne FSC measurements with the reference measurements was significantly lower than the uncertainty used in the reporting thresholds. It has also been shown that aerial measurements provide evidence-based data that, given an appropriate confidence interval, has the potential to be considered reliable legal evidence.

Assessment of the international maritime regulations’ impact in the North & Baltic Sea

“…Given the limited number of Tier III vessels currently in operation, the NECA implementation has not yet made a signi cant impact in reducing average NO x emission factors. Furthermore, previous studies already indicated increased NO x emission factors for Tier II vessels compared to Tier I vessels 14,24,29,33,39,40 . Consequently, the outcomes of this study align closely with the conclusions drawn from other research studies.…”

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

“…An OGV was considered to be non-compliant when it was measured with a value exceeding the yellow threshold. As non-compliance can, strictly speaking in accordance with the EU Sulfur Directive (2016/802) [3] and the European Commission Decision (2015/253) [7], only be legally proven with a positive fuel sample taken in port. All non-compliance detections at sea referred to in this evaluation are expressed as alleged non-compliance.…”

“…A mechanism was put in place to alert Belgian port inspection authorities to target those potential violations. By conducting these "remote" measurements (theoretically these types of measurements are in fact in-situ measurements), the Belgian port inspection authorities may reduce the number of mandatory port inspections by 50% [7].…”

Підвищення Ефективності Експлуатації Суднових Технічних Засобів За Рахунок Використання Низькосірчистих Сортів Суднового Палива

“…Source [8] discusses management tools for enforcing sulfur oxide reduction regulations in Latvia and Lithuania, providing insights into practical implementation. The work [9] introduces a novel method using Computational Fluid Dynamics (CFD) modeling to identify fuel sulfur content violations, showcasing technological advancements, while [10] offers valuable insights into crafting international regulations to address air pollution from ships, emphasizing the need for cohesive policies.…”