The authors proposed to use control levels depending on the category of an area to make an integrated hygienic and ecological assessment of the state of the area in the exploitation of radiation-dangerous objects as a main criterion for radiation and chemical factors. The average data of recent ecological monitoring on the level of radionuclides and chemical elements in all environmental objects (soil, atmospheric aerosols, surface water, and bottom sediments) may be used as background indicators in this area. The background indices and double mean-square deviation were proposed to take as a basis for calculating the control levels. The proposed model for calculating the control levels may be used to assess the state of an area of any radiation-dangerous objects.