Ключевые слова: air, air pollution, atmosphere, blue, chemical, chimney, clean, contamination, damage, danger, dangerous, detrimental, dioxide, ecology, electricity, emission, energy, environmental, factory, fume, fumes, furnace, gas, global pollution, global warming, greenhouse effect, heating, horizontal, industry, kyoto, outdoors, oxygen, petrochemical, pipe, pollution, sky, smog, smoke, smokestack, smoky, toxic, warm, white, wind,