Ключевые слова: air, air pollution, analysis, analyzing, chart, check up, checkup, concept, concepts, confusion, construction industry, control, danger, dangerous, definition, diagram, dictionary, doub, doubts, environmental damage, environmental issues, examination, examining, gas, graph, graphic, ideas, inspection, poisonous, pollution, problems, quality control, question, question mark, question marks, radiation, radioactive contamination, radioactivity, radium, radon, radon test, risk, safe, screening, test results, trends, uncertainties, uncertainty, vocabulary, water pollution,