STEVE PERCIVAL / SCIENCE PHOTO LIBRARY STEVE PERCIVAL / SCIENCE PHOTO LIBRARY
Traffic pollution. Truck driving through exhaust fumes. Motor vehicles are a major source of atmospheric pollutants, producing poisonous gases such as nitrogen oxides, carbon monoxide and ozone. They also emit unburnt hydrocarbons and microscopic particles of partially-burnt soot. Traffic exhaust fumes are the major air pollutant in cities.
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