We used the MALTE-BOX model to study new particle formation events in JPAC chamber. We found: 1. Compared to kinetic sulfuric acid nucleation, nucleation involving OH oxidation products of monoterpenes showed a better agreement with the measurements; 2. The model simulation revealed evidence of wall influence during the experiments. Thus, in order to capture the observed temporal evolution of the particle number size distribution, the model needs to consider reversible gas-wall partitioning.