M.A. Davydova, N.F. Elansky, O.V. Postylyakov, , Iu.V. Mukhartova, S.A. Zakharova, A.N. Borovski, Ya.M. Verevkin, N.A. Ponomarev Application of linear and nonlinear reaction-diffusion-advection models to simulation of transport of anthropogenic impurities and to assessment of emissions from agglomerations