6. Conclusions
In the first year that companies were subject to fleet average NOx requirement under the On-Road Vehicle and Engine Emission Regulations, a total of twenty-one companies submitted reports for 310 test groups comprising 1,350,719 vehicles of the 2004 model year manufactured or imported for the purpose of sale in Canada. The average NOx value for the entire Canadian LDV/LLDT fleet is 0.2016463 grams/mile compared to a fleet average NOx standard of 0.25 grams/mile. The average NOx value for the entire Canadian HLDT/MDPV fleet is 0.321976 grams/mile compared to a fleet average NOx standard of 0.53 grams/mile. The NOx values for both overall fleets are better than the corresponding fleet average NOx standards, consistent with the environmental performance objectives of the Regulations for the 2004 model year.