In line with the stricter environmental regulations applied in 2020, South Korea has introduced domestically new environmental laws applying voluntary speed limits for ships and emission control areas, according to data provided by North P&I Club.
Speed reduction
The Ministry of Maritime Affairs and Fisheries introduced the “Special Act on Air Quality Improvement in Port and Other Areas ” on 2 April 2019, enforcing the Act from 1st Jan 2020.
The first stage is a voluntary vessel speed reduction...
https://safety4sea.com/south-korea-introduces-speed-limits-and-ecas-for-ships/