Ключевые слова: air, alertness, analysis, analyzing, attention, building, chart, check up, checkup, concept, concepts, construction industry, control, danger, dangerous, diagram, examination, examining, focus, freedom, gas, graph, graphic, home, house, ideas, inspection, magnifying glass, measuring, poisonous, pollution, quality, radiation, radioactive contamination, radioactivity, radium, radon, radon air testing, radon level, radon measurement, radon test, research, risk, safe, safety, screening, searching, test results, testing, trends,