Ключевые слова: air, atmosphere, auto, automobile, background, black, car, carbon, care, city, combustion, concentration, contamination, control, danger, dirty, disaster, drive, dust, ecology, emission, engine, environment, environmental, exhaust, fuel, fume, gas, gasoline, gray, health, industry, medical, motor, pipe, poison, polluted, pollution, power, road, smog, smoke, steam, toxic, traffic, transport, transportation, truck, vehicle, wheel,