Ключевые слова: acid, air, architecture, atmosphere, background, business, chemical, chemistry, chimney, climate, cloud, co2, contamination, danger, dirty, ecology, effect, emissions, energy, engineering, environment, environmental, equipment, factory, fuel, fumes, gas, global, greenhouse, health, heavy, icon, industrial, industry, manufacturing, petrochemical, petroleum, pipe, plant, pollution, rain, refinery, sky, smog, smoke, solar, standard, toxic, vapor, warming,