US scrubber maker Pacific Green Trust (PGT) has reacted angrily to Singapore's intended criminalisation of seafarers who fail to comply with IMO 2020 regulations.

It called the possibility of up to two years in jail for the worst cases "an authoritarian provocation."

"Singapore is known as the Fine City," PGT said.

"Depending on your experience of the metropolis, this nickname could refer to immaculate streets, low crime, and enjoyment of the high life.