NUST MISiS, Moscow, Russia:

A. L. Petelin, Professor at the Department of Physical Chemistry, Doctor of Physical and Mathematical Sciences, e-mail: alexander-petelin@yandex.ru
T. L. Lepkova, Assistant Lecturer at the Department of Physical Chemistry, Candidate of Physical and Mathematical Sciences, e-mail: lepkova.tl@misis.ru
E. A. Novikova, Associate Professor at the Department of Physical Chemistry, Candidate of Physical and Mathematical Sciences, e-mail: e.a.novikova55@mail.ru
A. A. Novikov, Assistant Lecturer at the Department of Physical Chemistry, e-mail: novikov@misis.ru

This paper looks at the gas emissions balance in the wind corridor along the wind direction. An equation was found that describes the dependence of the emissions concentration inside the wind corridor along the wind direction when the concentration inside the wind corridor at the right angle to the wind flow is uniform. The authors propose a system of diffusion equations and its solution in a quasi-steady state for determining the concentration field in the whole space. It is shown that the transfer distance ratio has an approximate correspondence to the diffusion scope in the overall concentration. The diffusion scope was found to not exceed 0.01 %. And it becomes even lower as the wind speed rises and the time interval extends for which the diffusion transfer is analyzed. That’s why the wind transfer process can serve as a sufficient factor of changing concentration. To create a mathematical image of the concentration field for a given pollutant in the geographical coordinates, apart from the emission intensity and the chemical activity of such pollutant in air, one needs to know the wind rose of the region where the production site is situated. This helps determine the relationship between the maximum concentration of the pollutant and the distance (from the source of emission) in eight geographical directions, in eight points of the wind rose. It is noted that the use of the wind rose for mapping full information on the distribution of each pollutant helps superpose the fields of the maximum allowable concentrations (maximum hazard) of each pollutant with the geographical map of a particular production site. A relationship was defined between the maximum concentration of the pollutant and the source of emissions. The paper also describes the results of a study that looked at the transfer of emissions in air and determined the maximum distance for the maximum allowable concentration of sulphur dioxide emitted by Nornickel’s Norilsk site. It is demonstrated that when a light northeast wind blows (the average speed is around 3 m/sec), the SO₂ concentration in the northeast sector of the wind rose along the wind path is likely to exceed the maximum allowable mean daily concentration as far as 2,500 km from the site.

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