Ключевые слова: air, air pollution, asthmatic, atmosphere, carbon, chemical, chimney, climate, climate change, cloud, coal, concept, copy space, dioxide, dirty, ecology, emission, energy, environment, environmental, exhaust, factory, fuel, fume, gas, global, global warming, harmful, industrial, industry, ozone, pipe, plant, pollution, power, power plant, refinery, sky, smog, smoke, smokestack, stack, station, steam, technology, tower, toxic, warming, white,