Ключевые слова: 86, 222, aerated, air, aqueous, below, biological, breathing, brick, building, cleaning, comfortable, concept, cracks, crawl space, danger, dangerous, decay, deterioration, earth, environment, filtering, fissures, floor, flooring, foundation, gas, home, house, hygiene, illustration, inhaling, natural gas, paving, poisonous, polluted, pollution, radiation, radioactive, radioactivity, radium, radon, risk, rn, safe, soil, space, steam, stone, under, uranium, vapor, ventilated, ventilation, wall, wellbeing,