Ключевые слова: air pollution, brick wall, building activity, cancer illness, concept, concepts, confusion, crack, cracked, crannied, crevice, damaged, danger, deep, domestic life, doub, doubts, earthquake, erupting, escape, escaping, fissure, fissured, floor, gas, grounds, house, ideas, inhaling, lung cancer, natural gas, problems, protection, question, question mark, question marks, radiation, radioactive contamination, radon, radon gas, radon test, radonstop, residential building, risk, soil, subsidence, surrounding wall, uncertainties, uncertainty, wall building feature, water pollution,