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Ключевые слова:
air pollution, bedrock, building activity, business, city, construction barrier, construction industry, cracked, crawl space, danger, dangerous, domestic life, gas, groundwater, house, humidity, inhaling, lung cancer, natural gas, natural ventilation, poisonous, pollution, protection, radiation, radioactive contamination, radioactivity, radon, radon test, radonstop, residential building, respiratory system, risk, safe, security, soil, steam, vapor, vent pipe, ventilation, wall building feature, water pollution,