Fleet Average NOx Emission Performance of 2005 Model Year: 6. Trends in NOx Emission Performance of the Canadian Fleet
The changing distribution of LDV/LLDT and HLDT/MDPV by NOx standard (bin) across the 2004 to 2005 model years is depicted in figures 1 and 2, respectively.
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, while the distribution of the HLDT/MDPV fleet remained relatively similar. However, HLDT/MDPV fleets are only required to meet the final phased-in fleet average NOx standard of 0.07 grams/mile in the 2009 model year, compared to the 2007 model year for the fleets of LDV/LLDT.
Figure 3 compares the average NOx values achieved for the 2005 model year with those of the 2004 model year.
As shown in the figure, the average NOx value for the fleet of 2005 model year LDV/LLDT was reduced by about the same percentage as the applicable fleet average NOx standard, compared to the 2004 model year. However, the average NOx value for the fleet of HLDT/MDPV remained relatively unchanged. Nonetheless the average NOx values for both fleets remain below their respective standards by at least 22%.