it's not perfect but it's gotten better apparently. 170 countries have signed a treaty significantly reducing the fuel sulphur content. https://en.wikipedia.or

it's not perfect but it's gotten better apparently. 170 countries have signed a treaty significantly reducing the fuel sulphur content. https://en.wikipedia.org/wiki/MARPOL_73/78#IMO_2020 https://en.wikipedia.org/wiki/MARPOL_73/78#IMO_2020 https://www.imo.org/fr/MediaCentre/HotTopics/Pages/Sulphur-2020.aspx https://www.imo.org/fr/MediaCentre/HotTopics/Pages/Sulphur-2... https://www.imo.org/en/MediaCentre/PressBriefings/pages/02-IMO-2020.aspx https://www.imo.org/en/MediaCentre/PressBriefings/pages/02-I... The upper limit of the sulphur content of ships' fuel oil was reduced to 0.5% (from 3.5% previously) - under the so-called "IMO 2020" regulation prescribed in the MARPOL Convention. This significantly reduces the amount of sulphur oxide emanating from ships.