Authority to regulate emissions from marine propulsion engines smaller than 37 kW falls to Environment Canada. The Off-Road Compression-Ignition Engine Emission Regulations cover compression ignition marine engines less than 37 kW. Regulations are planned for marine spark-ignition engines.
Transport Canada has authority to regulate emissions from marine propulsion engines larger than 37 kW. Current emission standards from ships are under the authority of Transport Canada. The Air Pollution Regulations of the Canada Shipping Act regulates the density of black smoke from ships in Canadian waters and within 1 mile of land. Smoke density rating is determined by the Department of Transport Smoke Chart set out in the schedule of the regulations and reproduced below. For vessels with diesel engines a smoke density less than No. 1 is normally required with the exception that a smoke density of No. 2 for an aggregate of not more than 4 minutes in any 30-minute period is allowed.
Figure 1. Smoke Density Chart
Pollution Prevention Regulations under the Canada Shipping Act are under development to align with IMO MARPOL 73/78 Annex VI. This agreement sets limits for NOx emissions from marine engines with power outputs more than 130 kW that have either been installed on a ship constructed on or after January 1, 2000 or have had major conversions on or after January 1, 2000.