Briefly, the CAM-Chem model applies the 2-product parameterization to simulate the SOA formation, considers SOA formations from the oxidation of VOCs (monoterpenes, isoprene, benzene, toluene, and xylene), and includes reactions with key oxidants (OH, O3, NO3). The formed quantity of SOA at each time step depends on the gas-phase oxidation rate of VOCs (calculated in the gaseous chemistry module) and the production yield (estimated online based on the existing organic aerosol and the relative abundance of NO versus HO2, the so-called high NOx and low NOx conditions . The produced SOA increases the total burden of organic aerosol, either via condensing onto the existing aerosol or forming new aerosols. Here we further update the model to include alkanes and alkenes as the additional SOA precursors following and to include Cl and Br atoms as the additional oxidants following Choi et al. and Li et al. .