Ключевые слова: air, background, blue, brown, building, buildings, business, chimney, city, cold, construction, development, dusk, dust, ecology, energy, environment, environmental, evening, factory, frost, global, heating, hight, home, industrial, infrastructure, moscow, offices, pipe, pollution, power, roof, sky, smog, smoke, steam, sun, sunset, tower, toxic, urbanization, warming, white, winter,