This article is devoted to the study of indoor air quality in a higher education institution: assessment of the distribution patterns of suspended solids by equivalent diameters (RM0.5, RM1, RM2.5, RM5 and RM10).

Keywords: indoor air, indoor air quality, air pollution, dust, solid suspended particles, PM2.5, PM10

The results of scientific and experimental research on determining the width of the crack opening in concrete under the influence of mechanical load are presented. In the process of scientific research, a simultaneous complex measurement by tensometric and acoustic methods of the load of deformation, the width of the crack opening, the total count of acoustic emission was carried out to obtain complete diagrams of concrete deformation. As a result of the experiments, regression equations were obtained and the correlation dependence between the crack opening width and the total acoustic emission count was established.

Keywords: lightweight concrete, crack width, tensometric method, acoustic emission, deformation diagrams

The article addresses issues related to the definition of particulate matter characteristics in the air of roadside areas. Fine suspended solid particles (TPM) of different size -10 and 2.5 μm are one of the main characteristics of atmospheric air quality. When monitoring the air environment on the maintenance of the firm weighed particles two indicators are used and normalized: PM2.5, PM10 are the firm weighed particles (English Particulate Matter, PM) with an aerodynamic diameter of 2.5 microns or less; Solid suspended particles with aerodynamic diameter of 10 microns or less. Dust particles from traffic are seen as an increasingly important source of air pollution, as the vehicle fleet is increasing worldwide, hence exhaust gas emissions, as well as particles from tire abrasion and road surface wear. Studies were carried out on the dust content of the roadside territories of the city of Volgograd. The article also pays attention to air quality indices, which will be used in monitoring the air environment of urban areas.

Keywords: motor transport, dust, road dust, the firm weighed particles, PM2.5, PM10, the atmosphere, the air environment, ecology, ecology of the urbanized territories, environmental safety

An important problem of modern ecology is air pollution for most cities. Studies show that the largest danger to the human body is particles up to 10 microns in size, therefore, the content of suspended solids PM10 and PM2.5 (concentration) is controlled. The article presents the results of studies of air pollution with fine dust in the winter season

Keywords: dust, dispersed materials, suspended solids, PM2.5, PM10, atmosphere, air, ecology, ecology of urban areas, environmental safety

The paper describes a microscopic method for determining the dispersed composition of particles, a scheme for analyzing the dispersed composition of particles of various materials, the fundamentals of algorithms used in computer programs for the processing of particulate dispersion and the development of recommendations for their improvement.

Keywords: computer data analysis, technique, dispersion, particle diameter, dust, dispersed materials, ecology

In article metallurgical production as the metallurgy is one of the main sources of technogenic environmental pollution and a working zone is considered. Authors have described the main sources of formation of fine dust by results of which the analysis of fractional structure of the dust particles which are allocated during the operation of the arc melting furnace has been carried out. The submitted data demonstrate that the dust coming to rooms of the shop has the sizes from 3 to 18 microns. The share of mass of particles with sizes less than 10 microns in air of the electrosteel-smelting shop makes from 15%.

Keywords: fine dust, disperse analysis, sources of formation of dust, steel-smelting furnace, metallurgical dust