Ключевые слова: aerated, air pollution, alertness, attention, building, building activity, checking, concept, concepts, concrete, concrete casting, construction barrier, construction industry, construction site, crawl space, danger, dangerous, digging, excavation, floor, flooring, focus, foundation, gas, home, ideas, lung cancer, magnifier, magnifying glass, natural gas, natural ventilation, paving, poisonous, pollution, protection, radiation, radioactive contamination, radioactivity, radon, radon test, research, risk, safe, safety, searching, security, soil, surveillance, ventilated, ventilation,