Computational fluid dynamic (CFD) modelling of pollution dispersion and chemical conversion to aerosol particles in the atmospheric boundary layer (ABL) has been studied. The investigation focused on the numerical modelling above complex orographic terrains of urban areas and industrial sites including the dispersion of toxic substances in the air as a result of accidents. A finite-rate model of chemical reactions, including the turbulence chemistry for modelling the reaction between nitric acid and ammonia, has been applied. As supporting experiments, online monitoring of the spatial distribution of pollutants and aerosols has been performed above real complex areas. Minimal detectable concentrations 8 μg m
), 20 μg m
), 2 μg m
) and minimal detectable absorptivity 5 × 10
(aerosols) have been reached.
Keywords: computational fluid dynamic modelling, pollution dispersion, aerosol formation, spatial distribution, NH 4 NO 3 aerosol, turbulent environment