Ключевые слова: air, atmosphere, background, building, burning, chemical, chimney, city, climate, cloud, coal, day, dioxide, dirty, ecology, emission, emissions, energy, environment, environmental, exhaust, factory, fog, fuel, gas, global, high, industrial, industry, landscape, manufacturing, nature, pipe, plant, polluted, pollution, power, production, sky, smog, smoke, steam, sunset, technology, tower, toxic, urban, vapor, warming, white,