The paper describes a new air pollution dispersion model, AERMOD, that is designed for applications currently handled by the ISC2 model and beyond. AERMOD consists of: a meteorological interface that computes vertical profiles of wind, turbulence, and temperature; dispersion algorithms for the daytime convective boundary layer; dispersion algorithms for the nighttime stable boundary layer; treatment of surface, near-surface, and elevated releases (buoyant and no-buoyant); and treatment of complex terrain which accounts for the dividing streamline height concept (in stable flows) and applies for all terrain heights from stack base on up. Associated with AERMOD is a meteorological preprocessor and a terrain/receptor preprocessor that are also described. The paper also overviews the planned model evaluations and AERMIC's future plans for AERMOD.