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control.Therefore, effective multi-pollutant control strategies and in-use compliance programs are imperative to reduce the overall emissions from the transportation sector.
Wang et al (2012) shows that trucks with high BC EFs do not usually have high NOx EFs, and vice versa, indicating that the current emission standards implemented in Beijing and nationwide have only limited impact on NOx emissions
Table 5: Correlation measures the amount of HC between production years (2004, 2006 and 2008) by using t test in three modeles: Pride, Samand and 206 Peugeot HC Pride 2004*2008
2004*2006 Pearson Correlation DF t Sig. (2-tailed)
0.08 393 -2.42 0.016
Pearson Correlation DF t Sig. (2-tailed)
-0.009 413 -2.161 0.031
Pearson Correlation DF t Sig. (2-tailed)
-0.076 390 0.89 0.037
2006*2008
0.057 398 3.801 0 HC 206 Peugeot 0.11 409 -0.85 0.039 HC Samand -0.019 389 8.22 0
0.018 392 5.783 0 0.63 396 1.573 0.001 0.032 390 6.268 0
Table 6: Correlation measures the amount of CO between production years (2004, 2006 and 2008) by using t test in three modeles: Pride, Samand and 206 Peugeot
2004*2006 Pearson Correlation DF t Sig. (2-tailed) Pearson Correlation DF t Sig. (2-tailed) Pearson Correlation DF t Sig. (2-tailed)
CO Pride 2004*2008
0.008 366 5.6 0 CO 206 Peugeot 0.039 372 6.3 0 CO Samand 0.004 390 9.2 0
2006*2008
-0.025 366 6.697 0
-0.033 395 4.33 0
-0.029 368 6.233 0
-0.098 397 5.334 0
0.023 389 9.44 0
0.054 390 8.625 0