Ключевые слова: air, air pollution, atmosphere, background, building, chemical, chimney, climate, cloud, coal, contamination, damage, danger, dioxide, dirty, ecology, emission, energy, environment, environmental, factory, fog, fuel, fumes, global, global warming, industrial, industry, landscape, nature, pipe, plant, pollution, power, sky, smog, smoke, smokestack, station, steam, technology, tower, toxic, urban, warming,