Ключевые слова: air, atmosphere, background, burn, chemical, chemical industry, chemistry, chimney, city, climate, cold, contaminated, danger, destruction, dioxide, dirty, eco, ecology, emissions, environment, environmental, exhaust, factory, fumes, global, global warming, industrial, industry, landscape, manufacturing, nature, panning, petrol, pipe, plant, pollute, polluted, pollution, refinery, sky, smog, smoke, smokestack, steam, stink, toxic, toxic substance, unhealthy, winter,