Ключевые слова: air pollution, architecture, building, building activity, building exterior, cadastral, city, city life, concept, concepts, construction, construction industry, danger, dead, development, examining, flooring, gas, home, house, ideas, industry, map, natural gas, plan, planning, poisonous, pollution, radiation, radioactive, radioactive contamination, radioactive warning symbol, radon, radon gas, radon house, radon test, residential, residential building, safe, safety, social issues, structures, survey, testing, town, underground, urban, urban planning,