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, gas radon, grounds, house, ideas, inhaling, lung cancer, natural gas, protection, radiation, radioactive contamination, radon, radon gas, radon test, radonstop, residential building, risk, soil, subsidence, surrounding wall, wall building feature, water pollution,