32 PBM model dynamics: Mixing height growth: option to interpolate between minimum and maximum; Photolytica rate constants: diurnal variation of photolytica rate constants based on theoretical clear-sky insolation and attenuation based on cloud cover or oberserved insolation; Chemical kinetics: 63 reactions and 41 chemical species in 8 hydrocarbon classes (Demerjian generalized chemical kinetics) Mixing height growth: option to interpolate between minimum and maximum; Photolytica rate constants: diurnal variation of photolytica rate constants based on theoretical clear-sky insolation and attenuation based on cloud cover or oberserved insolation; Chemical kinetics: 63 reactions and 41 chemical species in 8 hydrocarbon classes (Demerjian generalized chemical kinetics)