Ключевые слова: air, atmosphere, blue, building, chemical, chimney, city, climate, cloud, contamination, damage, dioxide, dirty, ecology, emission, energy, environment, environmental, factory, fuel, fumes, gas, global, industrial, landscape, manufacturing, pipe, plant, pollution, power, production, refinery, river, silhouette, sky, smog, smoke, smokestack, station, steam, technology, tower, toxic, urban, warming, water, winter,