PL
Solar radiation is necessary for the proper development, maturing and functioning of the human body. A period of time when there was a deficit of solar radiation in the city of Krakow was identified and characterized. The period was selected based on diurnal values of cloudiness and sunshine duration from the years 1884-2009. An analysis of the impact of the deficit of solar radiation on the health and well-being of city dwellers was performed. Proposals were put forth on how to prevent the consequences of the lack of sunshine.