Ключевые слова: air, building, business, carbon, chemical, chimney, city, cloud, color, cumulus, damage, day, dirty, dramatic, dusk, dust, ecology, energy, environment, environmental, exterior, factory, fog, fumes, industry, light, nature, outdoors, pipe, pollution, power, scene, sky, skyline, smog, smoke, steam, structure, sun, sunset, technology, tower, toxic, urban, view, warming, winter,