Ключевые слова: air, atmosphere, blue, chemical, chimney, cleanliness, climate, cold season, contaminate, contamination, damage, dioxide, dirty, ecology, emission, emit, emitting, energy, environment, environmental, factory, fuel, fumes, gas, glass, global, greenhouse, heating, high, human, industrial, industry, ozone, pipe, pollute, polluting, pollution, power, sky, smog, smoke, smokestack, steam, technology, tower, toxic, vapor, warming, windows, winter,