Ключевые слова: air, architecture, artificial, bad, blue, boiler, building, business, chemical, chimney, clouds, construction, duct, energy, engineering, environment, equipment, exhaust, exterior, extraction, factory, gas, high, industrial, industry, large, material, metal, modern, outdoor, pipe, plant, pollution, power, production, roof, shiny, silver, sky, smoke, smokestack, station, steel, structure, summer, system, tall, technology, urban, ventilation,