#CMU study finds #SOA production from #PFI & #GDI vehicles “substantially” reduced https://t.co/AE3e0Vzud9
Although past studies have provided substantial insight, important gaps remain in our understanding of SOA formation from gasoline vehicle exhaust due to changing engine technology and emissions certification standards. California and the federal government are both phasing in new, more stringent regulations (LEV III and Tier 3, respectively). These standards meet or exceed the most stringent existing regulations, the California super ultra-low emission vehicle (SULEV) standard. In addition, largely driven by increases in the corporate average fuel economy standards, a dramatic change in gasoline vehicle engine technology is occurring in the United States. Historically, the US fleet has been dominated by vehicles equipped with port-fuel injection engines (PFI vehicles), but the market share of vehicles equipped with gasoline direct injection engines (GDI vehicles) has incr...