Ключевые слова: air, atmosphere, blue, building, chemical, chimney, city, climate, concrete, danger, day, dirty, disaster, ecological, ecology, electricity, energy, engineering, environment, environmental, factory, fuel, global, industrial, industry, large, old, pipe, plant, pollution, power, problems, refinery, sky, smog, station, steam, technology, tower, toxic, urban, view, warming, waste,