Ключевые слова: 86, 222, aerated, air, aqueous, bedrock, below, breathing, building, comfort, cracks, crawl space, danger, dangerous, decay, deterioration, earth, filtering, floor, flooring, foundation, gas, groundwater, home, house, illustration, inhaling, natural gas, paving, pipes, poisonous, polluted, pollution, radiation, radioactive, radioactivity, radium, radon, risk, rn, safe, section, shower, soil, space, steam, under, uranium, vapor, vent pipe, ventilated, ventilation, wall, wellbeing, wellness,