Ключевые слова: air, atmosphere, burning, business, chimney, city, cityscape, climate, dirty, dusk, ecology, emission, emit, energy, environment, environmental, factory, fuel, gases, global, industrial, industry, landscape, light, morning, night, pipe, pollution, power, production, refinery, sky, smog, smoke, smokestack, steam, steel, sun, sunlight, sunrise, sunset, technology, toxic, twilight, urban, vapor, view, warming, winter,