Ключевые слова: air, alone, atmosphere, backdrop, background, black, chemical, chimney, climate, cloud, concept, dirty, drift, ecology, environment, exhaust, factory, float, global, heavy, huge, illustration, industrial, industry, isolated, manufacture, manufacturing, night, pipe, plant, pollution, power, realistic, refinery, sign, smog, smoke, smokestack, stack, steam, strong, style, symbol, tower, transparent, urban, warming, white, work,