MEPC 84 and sulphur compliance: What the new ECA means for monitoring

At its 84th session in London last month, the IMO adopted a new Emission Control Area for the North-East Atlantic. The ECA map is growing fast, but the enforcement infrastructure to match it is not.

At MEPC 84, held in London from 27 April to 1 May 2026, the International Maritime Organization (IMO) formally adopted the North-East Atlantic as a new Emission Control Area covering waters off Greenland, Iceland, the Faroes, Ireland, the UK, France, Spain and Portugal. It enters into force in September 2027, with the strict 0.1% sulphur limit applying from 2028.

It is the latest addition to a rapidly expanding map. The Mediterranean ECA took effect in May 2025. The Canadian Arctic and Norwegian Sea follow in March 2027. Combined with the original Baltic, North Sea, and North American ECAs, a growing share of the world's busiest shipping lanes now carries strict sulphur limits.

Yet at the very moment that coverage expands, the verification infrastructure to enforce existing limits remains critically underdeveloped.

EU data from 2024 illustrates the problem, with just 1,500 vessels physically tested against the 0.1% ECA cap in European ports, while 8,500 were accepted on paperwork alone, out of millions of annual port calls. Sulphur emissions tend to be overshadowed by the focus on greenhouse gases, but SOx, NOx, and particulate matter pose serious and immediate risks. EU road fuels are capped at 10 parts per million of sulphur; marine fuels in ECAs can contain up to 5,000 ppm.

The IMO itself acknowledged at MEPC 84 that reducing SOx and NOx emissions directly lowers the risk of lung cancer, cardiovascular disease, strokes and childhood asthma. These are not distant or theoretical harms. Seafarers working on board, dockworkers handling cargo, and the millions of people living in coastal communities near busy ports are exposed to elevated concentrations of sulphur pollution every day. Shipping routes pass through some of the most densely populated coastlines in the world, the English Channel, the North Sea, the Mediterranean, where air quality impacts are felt far inland. Every vessel operating outside legal sulphur limits is not simply a compliance failure; it is a direct and measurable contribution to preventable illness.

The core challenge is verification. Traditional fuel sampling is costly and slow - by the time results arrive from an independent lab, the ship has usually left port. Continuous emission monitoring systems are improving but remain vulnerable to harsh marine conditions. Remote sniffer drones are being trialled in some regions but are not yet globally consistent, creating an uneven enforcement landscape that disadvantages operators who invest in genuine compliance.

Compact, carbon-neutral units like SeaARCTOS', powered by waste heat from ship exhausts, provide continuous direct monitoring of SO₂ and CO₂. They install in under an hour, transmit data via satellite in real time, and give ports, flag states, and regulators the ability to verify compliance as ships move, not days after they have gone.

For shipowners, the value extends beyond risk management. Charterers and cargo owners are increasingly demanding robust ESG data, and continuous emissions monitoring provides exactly the kind of transparent, auditable record that satisfies that scrutiny, while creating a genuine level playing field across fleets.

Closing the sulphur compliance gap is a regulatory requirement, a public health imperative, and with the right tools operationally achievable today. MEPC 84 has expanded both the geographic scope of the challenge and the international signal that enforcement is tightening. The infrastructure to match that ambition is ready.