A diesel engine with a power output of more than 5, 000 kW and a per cylinder displacement at or above 90 litres installed on a ship constructed on or after 1 January 1990 but prior to 1 January 2000, must fit an “approved method”, where commercially available, within a set time period. The effect of the approved method is to restrict NOx emissions to no more than the Tier I standard.
What NOX emission limits, if any, apply to engines in ships built before 1 January 2000?
