There has been increasing interest in recent years in the use of biodiesel as a substitute for petroleum-based diesel fuel. Biodiesel is derived from plant or animal fat-based oils or their transesterified counterparts. Several studies have found HC and PM benefits from the use of biodiesel, and its lubricity characteristics and renewability are also motivators for its use. Several municipalities and States are considering mandating the use of low levels of biodiesel in diesel fuel. Using existing data, the EPA's biodiesel emissions analysis program sought to quantify the air pollution emission effects of biodiesel for diesel engines that have not been specifically modified to operate on biodiesel. The program examined the emission impacts of biodiesel and biodiesel/diesel blends for both regulated and unregulated pollutants, as well as fuel economy.
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