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Fleet Average NOx Emission Performance of 2006 Model Year Light-Duty Vehicles, Light-Duty Trucks and Medium-Duty Passenger Vehicles

6. Trends in NOx Emission Performance of the Canadian Fleet

6.1 Distribution of Bins

The changing distribution of LDV/LLDT and HLDT/MDPV by NOx standard (bin) across the 2004 to 2006 model years is depicted in figures 1 and 2, respectively.

Figure 1: Distribution of LDV/LLDT by NOx Standard (Bin)

Figure 1. Column chart representing the changing distribution of LDV/LLDT by NOx standard (bin) across the 2004 and 2006 Model year.
Click to enlarge.

Figure 2: Distribution of HLDT/MDPV by NOx Standard (Bin)

Figure 2. Column chart representing the changing distribution of HLDT/MDPV by NOx standard (bin) across the 2004 and 2006 Model year.
Click to enlarge.

The percentage of LDV/LLDT certified to bin 5--which effectively represents the final phased-in fleet average NOx standard of 0.07 grams/mile--or better increased from 37% for the 2004 model year to 62% for the 2005 model year and then to over 85% for the 2006 model year. The distribution of the HLDT/MDPV certified to bin 5 or better increased slightly from less than 1% in the 2004-2005 model years to 9% in the 2006 model year. However it should be recognized that, whereas LDV/LLDT fleets are subject to the 0.07 grams/mile fleet average NOx standard beginning with the 2007 model year, the phase-in period leading to the final combined fleet average NOx standard of 0.07 grams/mile extends over the 2004 to 2008 model years for HLDT/MDPV fleets.  Beginning with the 2009 model year, the combined LDV/LLDT and HLDT/MDPV fleets will be subject to the 0.07 grams/mile fleet average NOx standard.

6.2 Fleet Average NOx Values

Figure 3 compares the average NOx values achieved for the 2006 model year with those of the 2004 and 2005 model years.

Figure 3: Fleet Average NOx Values and Standards

Figure 3. Line chart representing the average NOx value for the fleet of LDV/LLDT and HLDT/MDPV over the 2004 to 2006 model years.
Click to enlarge.

As shown in the figure, the average NOx value for the fleet of LDV/LLDT continued to decline by approximately the same percentage as the applicable fleet average NOx standard over the 2004 to 2006 model years. The average NOx value for the fleet of HLDT/MDPV declined by 23% between the 2005 and 2006 model years, after having risen slightly between the 2004 and 2005 model years. The average NOx values for both fleets remain below their respective standards by at least 21%.