Noting the overestimation of the nucleation potential due to the small system size, it can be seen that the oxide pathway is a more likely candidate to explain the nucleation rates reported for iodine nucleation by He et al., which are reported to be of the order of 226 10 2 cm -3 s -1 at IA concentrations of 10 7 cm -3 . This is despite the relatively low concentra- with clusters consisting of: (IA/IsA) 0-4 (W) 0-2 , "Oxides, oxyacid assisted" with clusters consisting of: (IP/IT) 0-2 (W) 0-3 and (IP/IT) 1 (IA/IsA) 1 (W) 0-2 , and "Oxyacids + mix" consisting of: (IA/IsA) 0-2 (base) 0-2 , where base is defined in the computational details, and consisting of (IA/IsA) (SA/MSA/NA/FA) 1 (base) 0-2 . The shaded area corresponds to relative humidities ranging between 34% and 73%.