That means shipowners who wish to ply these waters will have to stop using bunker fuel (the cheap stuff left over once petrol, diesel and aviation fuel have been distilled from crude oil) to power their vessels because burning it produces too much sulphur dioxide, nitrogen oxides and soot.
Neither of these products can be directly distilled into gasoline or fuel oil (kerosen, jet, and diesel) or indeed any other conventional petroleum product.
But numerous states today have their own variations on how oil is to be distilled into gasoline, as well as a raft of new requirements for various biofuels.