The article proposes a scheme of modernization of the gasoline engine to work on a gas-air mixture. This article discusses the technical characteristics of the engine on gasoline which is recommended by the manufacturer. The characteristics of the engine operation on the gas-air mixture without alterations, and the characteristics that the engine shows when working on the gas-air mixture with the already made changes are also given.

Keywords: car, gas equipment, intake valve, compression ratio, mixture pressure

Data on the effect on human health of dust from office air conditioners are presented. The microbial and dispersion composition of dust has been studied. Studies have shown that the microbial number in the rooms depends on the floor on which the air conditioner is installed. Also, the presence of large fractions of dust decreases with increasing height at which the air conditioner is installed.

Keywords: air pollution, dispersion analysis, air conditioning systems, human health,bacteria, mukor, aspergillus, penicillium

In article the qualitative structure of emissions of pollutants in the atmosphere of St. Petersburg is considered and also dynamics of change of volumes of emissions of solid substances on air environment of the city is analyzed

Keywords: emissions of pollutants, atmospheric air, the solid (weighed) substances, stationary sources, non-stationary sources

This article discusses the development of measures for the protection of atmospheric air during the construction industry. Particular attention is paid to the development and implementation of MPE projects and their implementation in the construction process. Also an important factor for environmental protection, including atmospheric air is the calculation of the radius of action of the sanitary protection zone of each construction site, depending on the sources of pollution. Particular attention is paid to the allocation of fine dust on the construction site, as well as measures to reduce these emissions. The article presents the results of the implementation of certain technological and organizational measures to reduce the release of PM10 and PM2. 5 fine dust particles on one of the construction sites of Rostov-on-don.

Keywords: protection of atmospheric air, fine dust, organization of construction

The article deals with the issues related to the study of aerodynamic and energy characteristics of the two layout solutions of mechanical ventilation and air conditioning systems - with the placement of the fan before and after the heater. Based on the use of graphoanalytic method of studying the parameters of the fan in the ventilation network, the dependences determining the aerodynamic and energy characteristics of the systems in three characteristic modes of their operation - at ambient temperatures equal to the design, the average temperature of the heating period and +8 ° C are obtained. The obtained dependences indicate that the installation of the air heater after the fan allows to increase the level of energy efficiency of the system in comparison with the placement of the air heater in front of the fan in the cold period of the year under the thermally unsteady operation of the supply ventilation system.

Keywords: fan, air heater, ventilation system, air conditioning system, power, energy saving, energy efficiency, non-stationary mode, the cold period of the year, the method of imposing characteristics

The results of the calculation of the hazard class of dust and gas emissions from the dryer of sewage sludge from the sewage treatment plant "Bzugu" in Sochi are presented.

Keywords: sewage sludge, dryers, dust and gas emissions, air pollution assessment

The article discusses the features of the climatic conditions of St. Petersburg, affecting the formation of the ecological situation in the city, including the content of fine dust particles in the atmospheric air.

Keywords: fine dust, temperature, relative humidity, wind speed, wind rose, air pollution

In the article, the groups of parameters of the properties of dust aerosol released into the air pool at the clay and sand transshipment sites of the construction industry, in particular at brick factories, are investigated. The main type of pollutant in the article is considered inorganic dust containing 70-20% silica. The properties of a dust aerosol are presented from the standpoint of the theory of stability of dispersed systems. The main classification feature in the distribution of the parameters of the properties of the groups selected physical nature of the processes and phenomena observed in the dust aerosol. As a result of the construction of a physical model of the process of air pollution, a detailed analysis of the objects involved in the pollution process was conducted.

Keywords: Atmospheric air, pollutant, overload unit, dust aerosol, parameters of dust aerosol properties, pollution reduction system

The article analyzes the theoretical approaches associated with the assessment and selection of the best efficiency of the complexes of methods and means to reduce air pollution in the operation of power plants as objects of urban economy. The advantages and disadvantages of each approach are considered. The physical-energy approach is highlighted as the most acceptable, in which the ecological efficiency and energy efficiency are the main criteria for the evaluation and selection of measures to reduce air pollution.

Keywords: energy facilities, environmental efficiency, energy efficiency, the physical-energy approach, reduction of air pollution

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

The article presents a comprehensive analysis of emission indicators from stationary sources and emissions from motor vehicles in the Rostov region and the city of Rostov-on-Don, as well as a comparative analysis for the two regions of the Southern Federal District. The forecast of the ecological situation is made and the adequacy of the proposed mathematical model is checked.

Keywords: emissions of pollutants, toxicity, exhaust gases, stationary sources, auto transport, internal combustion engine

The article presents a study of the existing practices of the use of toll roads on Federal highways of the Russian Federation, with the designation of the main advantages of users of toll roads and road facilities defined primarily by saving operating costs (transport costs) when traveling on a toll road, by reducing the consumption of fuels and lubricants, tire wear, repair costs and costs for other items of operating costs, and also saving of time of delivery of freights and passengers increase of comfort and safety of the movement

Keywords: a toll road, the toll gate, efficiency, savings, vehicle, the alternative road

Article is devoted geodetic researches, as the most important at designing of highways and airdromes. The complexes of works made at researches and designing are considered. Importance of topographical shooting of district by geodesists for creation of new cards, in the absence of cards, plans in contemporary records is noted. The special attention in article is given the modern geodetic equipment, such as: electronic recording tacheometer, GPS - antenna, and the 3D- scanner. These devices, their versions, scopes are in detail considered. The purposes and problems GPS of measurements, and also methods of work GPS of receivers are considered. In article- geodetic maintenance at building of elements of an airfield is in more details considered. Kinds of the works, which are carried out by geodesists, are designated. It is noticed that use of the modern equipment and software product AutoCAD, AutoCAD Civil 3D, CREDO, GENERAL PLAN Geonics, etc. To analogues of these software allows to save not only time for processing of field measurements, but also to carry out continuous control of a thickness of separate layers at packing that, in turn, leads to economy of means. In the conclusion authors underline special importance and responsibility assigned to geodetic service. It is noticed that introduction of the innovative equipment in all structures of road building will undoubtedly set good rate in development of a network of highways and airdromes.

Keywords: Geodetic researches, highway, electronic recording tacheometer, GPS - antenna, laser 3D - the scanner, topographical shooting, airdrome, aerial photography

The article considers the device for experimental and laboratory testing of microclimate systems. The device is an experimental setup in which it is possible to study the microclimate parameters of multi-functional and multi-level buildings by modeling various processes and their location in the total volume of buildings. Accordingly, with the help of this test model, the parameters of the movement of contaminated air masses and convective flows are studied.

Keywords: test model, installation, microclimate, multi-functional multi-level buildings, process modeling, air, convective flows

A scheme of the HVAC system with local (zone) air handling units providing the possibility of heat and humidity treatment of air is developed to maintain the set temperature and relative humidity of the supply air. Features of regulation of moisture content of supply air in HVAC systems are considered and an analysis of air processing processes was carried out using the I-d diagram for the warm and cold periods of the year. A method for control the moisture content of the supply air is described, which allows more accurately to maintain the air parameters when the heat and humidity loads in the serviced rooms change.

Keywords: multizonal HVAC system, local (zone) air handling units, heat and moisture exchange, I-d-diagram, regulation of moisture content