Ключевые слова: air, background, building, business, carbon, chemical, chimney, city, cityscape, color, construction, day, dirty, dusk, ecology, energy, environment, environmental, factory, fog, fuel, gas, global, industrial, industry, landscape, light, nature, office, outdoors, pipe, plant, pollution, power, silhouette, sky, skyline, smog, smoke, steam, structure, sun, sunset, technology, tower, toxic, urban, view, warming, winter,