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