Ключевые слова: air, atmosphere, background, business, chemical, chimney, city, climate, cloud, dirty, dusk, ecology, electricity, energy, environment, environmental, factory, fuel, fumes, gas, global, industrial, landscape, manufacturing, morning, nature, orange, pipes, plant, pollution, power, production, refinery, sky, smog, smoke, station, steam, sun, sunset, technology, tower, toxic, urban, warming, winter,