Ключевые слова: black, breathing, business, chemical, chemistry, computer, concept, construction, danger, dangerous, dust, ecology, environment, equipment, face, filter, gas, gasmask, guard, hand, hard hat workers, health, helmet, human, industrial, industry, man, mask, medicine, multipurpose, person, pollution, portrait, protection, protective, respirator, risk, safety, single, stop, suffocate, suffocation, technology, toxic, warm, white, work, work wear, worker, yellow,