Residential buildings design in view of insolation requirements by Russian and European standards

Insolation, defined as direct solar irradiation of surfaces and spaces, provides the Sun natural ultraviolet radiation from and is a natural factor in which man was formed. The insolation of residential, public buildings and adjacent territories helps to limit the spread of viral and bacterial diseases, pathogenic microflora transmitted by airborne droplets and through publicly accessible indoor surfaces. The article analyzes the features of domestic and foreign insolation duration rationing. It is shown that Russian standards provide a higher density of urban development compared to the European Union standards. They are the limit beyond which a sharp decline in the urban environment quality and difficult-to-predict infections epidemiological risks begin.