Ключевые слова: air, atmosphere, building, business, chemical, chimney, city, cloud, clouds, dirty, ecology, electricity, emission, energy, environment, environmental, evening, factory, fuel, fumes, gas, global, industrial, industry, landscape, light, nature, pipe, plant, pollution, power, production, silhouette, sky, skyline, smog, smoke, smokestack, station, steam, sun, sunrise, sunset, technology, tower, toxic, urban, vapor, view, warming,