Wartsila has warned that new retrofitting orders for scrubbers will now miss the IMO's 2020 deadline.

Roger Holm, the Finnish technology company's marine solutions president, said: "We are still seeing good activity, but if you haven't ordered now you are not going to get them for 1 January, so new orders will be delivered into the new regulations.

"The key question is will that have an impact, but it's too early to say.