Ключевые слова: air, atmosphere, background, black, blue, building, chemical, chimney, city, climate, cloud, cloudy, co2, coal, company, contamination, dark, dirty, dusk, ecology, electricity, emission, energy, enviroment, evening, factory, fumes, gas, global, indstry, manufacturing, morning, nuclear, pipe, plant, plume, polluting, pollution, power, production, purple, scene, sky, smog, smoke, smokestack, steam, sunset, toxic,