Ключевые слова: air, atmosphere, breathing, carbon, chemical, chimney, climate, cloud, concentration, contamination, crisis, damage, dioxide, dirty, earth, ecology, electricity, emission, energy, environment, environmental, exhaust, factory, fuel, fume, gas, global, industrial, industry, manufacturing, outdoors, oxygen, ozone, pipe, plant, pollution, power, problem, production, safety, saving, sky, smog, smoke, smokestack, stack, steam, technology, tower, toxic,