Ключевые слова: air, atmosphere, chemical, chimney, climate, cloud, co2, contaminate, contamination, dirty, eco, ecological, ecology, emission, emissions, emit, environment, environmental, exhaust, factory, fog, fumes, harmful, industrial, industry, manufacture, manufacturing, nature, ozone, plant, pollutant, pollute, polluting, pollution, refinery, single, sky, smog, smoke, smokestack, stack, steam, technology, toxic, tree, urban, vapor, warming, waste, working,