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Interest in biodiesel is increasing in the United States because it is a renewable fuel source that decreases carbon monoxide, unburned hydrocarbon, and particulate matter emissions. Although it is more expensive than petroleum based diesel fuel, it is a cost-effective fuel for government agencies to obtain EPAct alternative fuel credits. However, a 20% biodiesel blend in diesel fuel (B20) causes an average increase in NOx emissions of 2-5%. The emissions of NOx are critical, especially in ozone non-attainment areas, making the increase with biodiesel problematic to its widespread use. Using cetane improving additives and modifying feedstock composition are two possible methods to reduce NOx emissions from biodiesel. This study further explores the feasibility of these methods.