Ключевые слова: air, atmosphere, blue, building, car, chemical, chimney, chrome, dioxide, dirty, ecology, energy, engine, environment, environmental, exhaust, exhaust ventilation system, factory, fuel, fumes, gas, global, industrial, industry, machine, manufacturing, metal, metallic, motor, pipe, plant, pollution, power, refinery, sky, smog, smoke, speed, station, steam, steel, supply, technology, tower, toxic, transport, transportation, vehicle, warming, white,