Current emission trading systems consider long-lived trace gases, “Kyoto gases” like carbon dioxide, nitrous oxides and methane. It is widely accepted that emissions of short-lived gases,mlike NOx also have considerable impact on climate change (Derwent et al., 2001; Wild et al., 2001; Uherek et al., 2010; Lee et al., 2010; Eyring et al., 2010).