The basis of a hygienic assessment of the influence of microclimatic conditions should be based on its final effect. The effect can be considered positive if it helps to maintain the temperature constancy of the body, and negative if it causes its disturbance. A different combination of microclimatic environmental factors can have both beneficial and adverse effects on the body. Moreover, the negative influence of one of the factors can be almost completely compensated by the positive effect of the other. For example, high humidity, both with increasing and decreasing air temperature, disturbs the well-being of a person. The greater the relative humidity at a given temperature, the lower the heat transfer by evaporation. When the humidity reaches 75–80% at an air temperature close to the skin temperature (31–33.5 ° C), and most of the heat generated by the body is released by evaporation, it can overheat. Under such conditions, the regulation of heat transfer between the body and the environment is difficult, and with complete saturation of the air with moisture it is generally impossible. Adverse effects on the body of high relative humidity at low temperatures are due to the fact that humid air conducts heat better than dry air, as a result of which heat loss increases. At low temperature and high humidity, the movement of air plays a significant role – the larger it is, the stronger the heat transfer and the greater the cooling of the body. The movement of air determines the supply to the human body of ever new layers that are coming .