theoretical aspects of solid and gaseous substances spreading from sources of exhalations

The contribution is focused to the determination of the point of exhalation maximal concentration in the surroundings of pollution source in ground-close air layer for gases and solid particles, which of diameter does not exceed 0,1 µm. The analytical curve in the plane of ground layer was also constructed with the aim to demarcate the area where the contaminants concentration oversteps the permitted level. The general equation for the exhalation computation is also the basic one for the computation of dust deposition in the surroundings of pollution source.Theoretical calculation of concentration of noxious material from a point source in solution of differential equation (1) providing: the betinning of square coordinate system x1, x2, x3 is on the heel of the point source namely that x1 axis direction is the air circulation direction (the wind ) and the x3 axis is the same as a level of source direction; the source of noxious material is a continuously alternative source; the wind direction is the same as the coordinate axis x1 direction and its speed is constant by amout and direction; speed of convective transmission considerably rises the speed of diffusive transfer of elements; for diffusive coeficients D2, D3 we suppose D2 ≠ D2(x2), D3 ≠ D3(x3).Instead of diffusive coeficients D2, D3 there are establishes the parameters of diffusion σ2(x1), σ2(x3) by means of formula (4), where the meteorogical parameter n of Sutton is characteristic the bedding of the atmosphere. The speed of the wind which is taking on the level 10m above the ground of surrounding field and it is reducing to the necessary level according to (6) and the rate between the surface 10m and the surface of effective level h is calculated according to (7). Parameter p is depending from the category of air stability (tab. 1). The effective level h is calculated according to (8), (9). The analytical formulation was expressed by means of σ2,σ3 dispersion coeficients α2,α3,β2,β3 (Tadmor, 1969) on the tab.2.On the basis of the formula (5) is a calculation of noxious material concentration divided into some groups. It is calculated the exhalat concentration for the group of gases and the small elements ≤ 0,1 µm in the optional point of area in the surrounding of sourceThe formula (12) is supplying the concentration of the noxious material on the ground layer (x3 = 0) in the wind direction when is a direction and the power fixed and when the tapping of wind is impossible.By means of formula (13) we could find instead of maximum exhalat concentration the ground layer by permanent and by the constant meteorogical conditions. Its calculated figure of line in the ground layer which is bounding the area when the concentration of noxious material are exceeding the flowing limit Ck..