Ключевые слова: air, atmosphere, background, building, chemical, chimney, city, climate, cloud, contamination, dawn, dirty, dusk, ecology, emission, energy, environment, environmental, evening, factory, fuel, gas, global, industrial, landscape, manufacturing, nature, oil, orange, pipe, plant, pollution, power, production, red, refinery, silhouette, sky, smog, smoke, steam, sun, sunrise, sunset, technology, tower, toxic, urban, warming, winter,