Biodiesel blends up to B20 are compatible with diesel emission control technologies such as diesel particulate filters and selective catalytic reduction systems. Testing showed B20 lowers DPF regeneration temperatures and increases particulate oxidation rates. EPA emissions evaluations found no significant difference between B20 and ULSD with NOx adsorber catalyst and SCR systems on a light-duty vehicle over 120,000 miles. Additional research is ongoing to understand long-term impacts of biodiesel blends on modern emission control systems.