Characterizing emission rates of regulated pollutants from model year 2012Â + heavy-duty diesel vehicles equipped with DPF and SCR systems

Fig. Comparisons of NOx emission rates from this study, ARB and SCAQMD studies for SCR-equipped 2010 + vehicles over the UDDS; D1* represents the UDDS emissions level found after retesting the manufacturer D1 truck after a regeneration; A2** and B** represents results from ARB retest.130