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The population living in areas rich in granites, minerals and soils with high concentrations of natural radionuclides is exposed to higher external radiation. Significant part of a person's time resides in buildings where he lives and works. The walls, floors and roofs of the buildings shield (weaken) the external gamma background. The aim of the work is to determine the content of natural radionuclides in rock and inorganic materials used as building materials of samples taken from different buildings in Southern Bulgaria by analysing the samples and measuring their natural radioactivity, then to compare the results with the maximum concentrations of activity in common building materials. also used in the EU. The data obtained from the analyzes do not give grounds to expect the generation of radionuclides from natural and conventional inorganic building materials used in the studied areas.

Exposure to indoor air pollutants is one of the primary environmental health stressors, the most important categories of chemicals that occur in the indoor air are BTEX (benzene, toluene, ethylbenzene and xylenes). All of them are used in many commercial building products and materials use indoor. Each of the chemicals in the mixture of concern is volatile, well absorbed, extensively metabolized, and does not persist in the body for long periods of time. All of the BTEX chemicals can produce neurological impairment. The aim of this work is on research and analysis of indoor air quality. seasonal fluctuations and to assess the impact of chemical pollutants in a closed environment in southwest Bulgaria.