The US Port of Seattle said that ships docking at the port have minimised sulphur oxides emissions by 80% and diesel particulate matter by 60%.

The emissions reduction has been run through a programme called At-Berth Clean Fuels (ABC Fuels), which aims to cut maritime air emissions as part of the Northwest Ports Clean Air Strategy.

Vessels which participate in the scheme agree to use low-sulphur fuel (0.5% or less) in auxiliary engines while docked in the port. In exchange, the Puget Sound Clean Air Agency provides participating vessels with $1,500 for each port call.

So far, 37 ships from six container lines and one cruise line are participating in ABC Fuels, representing about 35% of the vessels that make frequent calls at the port.