The nonlinear chemistry of ozone formation from oxides of nitrogen causes that NOx emissions, that are in a regional-scale or a global models distributed directly over large grid squares, form more ozone than if they were treated in a gradually dispersing plume. An efficient method of plume parameterisation has been described by Cariolle et al. (2009) where the plume stage of emission is treated as a tracer and parameterised reaction rates for ozone and NOx losses in plume are given for aircraft plume. The rates of reactions affecting ozone, NOx and OH have been studied with a plume model of Lagrangean type and a loss term for NOx and OH in plume is defined for the parameterisation.