Noise pollution of the air is considered to be an excess of the natural level of the background noise or a sharp fluctuation and change in such sound characteristics as the frequency of the sound wave and the strength of the sound stream. The article considers noise levels in the mainline territories in a linear city.

Keywords: linear city, traffic noise, highways, air environment, landscaping, equivalent noise level, row of planting, arboretum composition

The article considers the directions and speeds of the air flow characteristic of the linear city of Volgograd. Weibull's law was tested for various wind speeds in various wind directions characteristic of Volgograd.

Keywords: climate, linear city, wind speed, wind direction, distribution law, distribution law, Weibull law, logarithmically normal law, impurity transport

The article deals with the distribution of fine dust in the atmospheric air of roadside areas of cities with a linear configuration, factors affecting its concentration in the roadside area.

Keywords: fine dust, roadside areas, road transport, wind speed, meteorological parameters

The article considers the content of dust particles in the filter of the split system of a residential building and in the air of an air-conditioned room, the material is taken, as well as its analysis for the content of fine dust.

Keywords: fine dust, residential air conditioning system, bacteria, integral distribution functions, "dissection"method

Numerical simulation is becoming more and more widespread when solving the problems of air distribution and inflow air rate. One of the questions of using CFD approaches legitimacy is the possibility of a reliable description of the flow in modern air distribution devices. In the present work, physical and numerical experiments were carried out for the SMK 200 jet nozzle diffuser. Velocity profiles were taken at various distances from the jet nozzle during the physical experiment. Numerical investigation tool was the integrated package STAR-CCM +. Numerical simulation was carried out using various turbulence models. Simulation results showed that the use of the k-ɛ models allows to describe the parameters of the flow with sufficient accuracy. Number of cells required for the correct flow description in modern air distribution device is suitable for practical application.

Keywords: air distribution, numerical simulation, turbulence models, physical experiment, jet nozzle diffuser, STAR-CCM+

One of the criteria for the effective operation of modern machines, machinery, tools and devices is a quiet drive. Research noise generation in mechanical gears is important. A modernization drive with a flexible link, as a method of solving the problem of noise reduction.

Keywords: noise, vibration, drive, machine, mechanism, chain drive, toothed belt drive, a study, a flexible connection

One of the criteria for the effective operation of modern machines, machinery, tools and devices is a quiet drive. Research noise generation in mechanical gears is important. A modernization drive with a flexible link, as a method of solving the problem of noise reduction.

Keywords: noise, vibration, drive, machine, mechanism, chain drive, toothed belt drive, a study, a flexible connection

In this article is reviewed the nature of organic hybrid nanocomposites. Promising directions in the field of organic hybrid nanocomposite materials will be methods for the synthesis of multicomponent materials, as well as the type of "net net" and "host-guest". The fundamental problem with the chemistry and physics of nanocomposites is dependent "structure-property". Solving this problem will move from research materials to their purposeful design.

Keywords: nanocomposite sol-gel technology, synthesis, nanoparticles.