Ключевые слова: air, air pollution, analysis, analyzing, breathing, chart, check up, checkup, concepts, construction industry, control, danger, dangerous, diagram, environmental damage, environmental issues, examination, examining, gas, graph, graphic, home, house, inspection, natural gas, periodic table, poisonous, pollution, quality control, radiation, radioactive, radioactive contamination, radioactivity, radium, radon, radon gas, radon house, radon test, residential building, risk, safe, screening, soil, steam, test results, trends,