The IMO addresses air pollution through MARPOL Annex VI, regulating sulphur oxides (SOx), nitrogen oxides (NOx), and particulate matter from ships.
Since January 1, 2020, the global sulphur limit for marine fuel was reduced from 3.50% to 0.50% by mass (m/m). However, some regions, known as Emission Control Areas (ECAs), enforce stricter limits of 0.10% sulphur content. A list of special areas, including those under Annex VI, can be found
Full advisory at the following link.
https://north-standard.com/insights-and-resources/resources/news/marpol-emission-control-areas