Assessment of atmospheric pollution in the city of Naberezhnye Chelny with emissions from motor vehicles and industrial enterprises

The information on existing stationary sources of atmospheric pollution, their qualitative and quantitative characteristics, factual emissions was collected and analyzed within the framework of the present study. On-site investigations of the structure and intensity of the traffic flow on the main thoroughfares of Naberezhnye Chelny were conducted. Based on the obtained data, a summary calculation of 143 pollutantswas carried out, taking into account those, included in 28 summation groups;maps of distribution of air pollution level throughout the city were drawn and analyzed for each substance, first-ever for Naberezhnye Chelny.Based on the results of calculation of pollutants dispersion, a forecast was made for the concentrations of pollutants in the residential area of the city. The substances and summation groups, for which maximum permissible concentration is likely to be exceeded (carbonic oxide, nitrogen dioxide and the summation groups, formed by these substances) were detected. Along major automobile highways and interchanges, the zones with expected values of maximum surface concentrations of more than 1 MPC were observed for carbonic oxide.To estimate the relative share of emissions from stationary and mobile sources, the calculation was carried out, without taking into account the vehicles and enterprises of the motor transport complex. It was found, that the calculated emissions of carbon oxide and nitrogen dioxide by stationary sources, in comparison with mobile sources, are not so significant and cause no more than 0.1 MPC.By the nature of spatial distribution, two distinctly different groups of pollutants were defined: mainly contained in emissions of industrial enterprises, and coming into the atmospheric air, mainly with emissions from automotive transport.Keywords: emissions fromautomotive transport, maximum permissible concentration, calculation of dispersion, maps of spatial distributio