Ключевые слова: air pollution, analyzing, brick wall, building, building activity, concept, concepts, crack, crevice, damaged, danger, dangerous, emblem, energy, examining, field, fissure, fissured, flag, floor, gas, gas radon, ideas, industry, lawn, lung cancer, meadow, natural gas, nature, poisonous, pollution, protection, quality, radiation, radioactive, radioactive contamination, radioactivity, radon, radon gas, radon test, radon testing, risk, russia, safe, safety, soil, symbol, testing, text,