“…Alkenes are the most abundant volatile organic compounds (VOCs) in the atmosphere after methane and primarily originate from anthropogenic and biogenic sources (Lester and Klippenstein, 2018;Guenther et al, 2000). Alkene ozonolysis produces a carbonyl oxide (also called Criegee intermediates; CIs) and a carbonyl moiety (Donahue et al, 2011a;Aplincourt and Ruiz-López, 2000;Johnson and Marston, 2008;Welz et al, 2012;Criegee, 1975;Taatjes et al, 2013), which is thought to be an important source of radicals, whose subsequent reactions lead to the formation of hydroperoxides, organic peroxides, and secondary organic aerosol (SOA) (Donahue et al, 2011a;Becker et al, 1990;Kroll and Seinfeld, 2008;Hallquist et al, 2009;Tobias and Ziemann, 2001).…”