A Lagrangian trajectory model simulating the formation, transport and deposition of
secondary organic aerosol is developed and applied to the Los Angeles area, for the air
pollution episode of 27–28 August 1987. The predicted secondary organic aerosol on 28
August 1987 represents 15–22% of the measured particulate organic carbon at inland
locations in the base case simulations, and 5–8% of that at coastal locations. A maximum
secondary organic aerosol concentration of 6.8 μg m− 3 is predicted for Claremont, CA …

The size distribution of atmospheric secondary organic aerosol is simulated by a Lagrangian
trajectory model that includes descriptions of gas-phase chemistry, inorganic and organic
aerosol thermodynamics, condensation/evaporation of aerosol species, dry deposition and
emission of primary gaseous and particulate pollutants. The model is applied to simulate the
dynamics of aerosol size and composition along trajectories on 27–28 August 1987 during
the Southern California Air Quality Study (SCAQS). The secondary organic aerosol material …