Ключевые слова: air pollution, air testing, architectural feature, architecture, brick, brick wall, checking, concept, concepts, conceptual, construction industry, crack, cracked, crevice, danger, dangerous, deep, examining, fissured, focus concept, gas, house, ideas, lens optical instrument, magnifier, magnifying glass, periodic table, periodic table elements, periodical table, pollution, radiation, radioactive, radioactive contamination, radioactive pollution, radioactivity, radon gas, radon house, radon test, radon testing, risk, risk analysis, safe, safety, wall building feature, warning symbol,