Denmark's AP Moller-Maersk has changed tack on scrubbers, saying it will fit exhaust cleaning devices to some of its ships.

"As part of the preparations we have decided to invest in new scrubber technology on a limited number of vessels in our fleet of around 750 container vessels," Niels-Henrik Lindegaard, head of Maersk Oil Trading, told Reuters.

"Using scrubber technology is a small part of – and just one of several elements in – our overall 2020 fuel sourcing strategy to ensure compliance in time," he said.