Ключевые слова: air, atmosphere, blue, chemical, chemistry, chimney, climate, cloud, concept, dioxide, dirty, earth, ecology, effect, energy, environment, environmental, exhaust, factory, fuel, fume, gas, global, greenhouse, hazard, industrial, industry, manufacturing, nature, ozone, pipe, plant, pollute, polluting, pollution, power, problem, refinery, sky, smog, smoke, steam, technology, tower, toxic, vapor, warming, waste, white,