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