The pollution of the urban atmosphere in the area of the direct action of the motorway is considered. A certified environmental impact assessment methodology was used as the master. With its help, the masses of substances – that are primary pollutants – emitted per unit of time are calculated depending on the intensity of the traffic flow. Further, to calculate their concentrations, the dispersion is calculated. In order to determine the concentration of the secondary pollutant, ozone, a mathematical model is proposed. It is a stiff system of differential equations that describes the kinetics of the process of chemical transformation of primary pollutants. To solve it, the Rosenbrock method was applied. The influence of the traffic flow density on the ozone content near the highway is being studied
The kinetics of chemical transformations of the most significant pollutants in the cramped aerodynamic conditions of the urban atmosphere is considered, i.e. in the gaps between rows of wide buildings with significant height. High concentrations created in those areas lead to sufficiently high values of reaction rates. The process is described by a stiff system of differential equations, the solution of which is performed by Rosenbrock method. The effect of reduced carbon compounds and nitrogen oxides in a wide range of their concentrations on the rate of formation of a highly toxic secondary pollutant is investigated. In the course of numerical experiments, conditions are determined that correspond to its maximum value. In that case, the transfer of substances from the reaction zone does not have time to occur.
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