We use new airborne and ground-based observations from two summer 2013 campaigns in the Southeast US, interpreted with a chemical transport model, to understand the impact of isoprene and monoterpene chemistry on the atmospheric NOx
budget via production of organic nitrates (RONO2
). We find that a diversity of species contribute to observed RONO2
. Our work implies that the NOx
sink to RONO2
production is only sensitive to NOx
emissions in regions where they are already low.