[Physical environmental factors of a city park and intraresidential green plantings].

The characteristic features of sun radiation (direct, scattered and total) and natural ultraviolet radiation are outlined under conditions of planting and grassing of areas in different patterns, designed for large-scale public utilization (The Park of Liberty-Sofia), as well as for limited utilization (intra-residential open spaces of the residential districts "Lenin" and "Svoboda"). As the result of the study concrete comparative data are obtained, both in relative and in absolute energetic units, data which may be used as a basis to determine the places of recreation, and the type and extent of planting and grassing in accordance with the anticipated effect - degree of sun protection seeked, or securing sufficient quantitatively and optimal in terms of spectural composition solar radiation.