An implementation of ISORROPIA II, a model for the thermodynamic equilibrium of gas-aerosol interactions, as described in:

Fountoukis, C. and Nenes, A., 2007. ISORROPIA II: a computationally efficient thermodynamic equilibrium model for K+–Ca 2+–Mg 2+–NH 4+–Na+–SO 4 2−–NO 3−–Cl−–H 2 O aerosols. Atmospheric Chemistry and Physics, 7(17), pp.4639-4659.