Mathematical modeling of the formation of nitrogen-containing air pollutants. 1. Evaluation of an Eulerian photochemical model

A grid-based, Eulerian airshed model has been used to the formation and control of gas- and aerosol-phase -containing air pollutants. The performance of model was assessed by comparison against field measurements made for this purpose in the Los Angeles area the period 30-31 August 1982. Model predictions for _3 and peroxyacetyl nitrate (PAN) concentrations are in agreement with observations. The absolute values the total inorganic nitrate, NH_3, and HNO_3 predictions the average are within a few ppb of the observations. an inventory of ionic and alkaline aerosol emissions, accurate apportionment of total inorganic nitrate the aerosol and gas phases is not possible at locations. At midbasin sites like Anaheim, where _4NO_3 is the dominant nitrate aerosol species present, aerosol nitrate levels predicted by the model are in agreement with observed values.