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Diesel fuel properties influence diesel exhaust emissions. This study determined the effect of fuel cetane number and aromatic content on emissions from a heavy-duty diesel engine meeting 1994 emissions standards. No exhaust aftertreatment devices were used in this study. The fuel set was selected to separate the cetane effects from the aromatics effects, since otherwise these effects can be easily confused. Other fuel property effects, such as density, were also considered in the selection of the fuel set. This study found that increasing cetane number reduces all regulated diesel emissions species. Reducing aromatic content reduces NOx and particulate emissions, as was found in the previous Amoco/Navistar study, but this time the aromatics effect was less and the cetane effect was greater. When compared to the CRC VE-1 Phase 2 study, aromatic effects were almost identical and cetane effects were similar on all emissions.