Micrometeorological wind and diffusion fields are simulated for a winding river valley cutting through a complex terrain domain with morphological land features also present. The simulation site is the Mosel River Valley (middle Mosel) in the vicinity of Traben-Trarbach, Germany. Terrain and morphology (vegetation, buildings, water etc) data are derived from German mapping data files. The meteorological simulation code calculates the mean wind fields and several turbulence parameters for input into a Gaussian puff diffusion code so that aerosol plumes can travel with the simulated, deformed wind field. Cases are prepared to investigate flow regimes (a) along the river's main axis (225 degrees) and (b) cross valley (about 315 degrees). Each case is run for both moderate (about 5 m/s) and light (about 2 m/s) wind speed conditions and unstable and stable atmospheric conditions. Directional influences are also imposed for downslope and down valley flows during stable conditions and upslope and up valley flows during unstable conditions. High resolution calculations are made for a grid size of 100 m within a computational domain of 10 km x 10 km. The wind fields clearly respond to the variety of terrain and meteorological conditions imposed as did the behavior of the aerosol plumes. Aerosol concentrations are particularly enhanced by the terrain configuation during stable conditions for the light wind speed cases.