MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Air pollution mask. View of a young child standing by a roadside where a car exhaust releases pollutants into the air. She is wearing a face mask to protect her from air pollution. The main source of air pollution in cities is from car exhausts. Cars produce poisonous gases such as nitrogen oxides, sulphur oxides, carbon monoxide and ozone. They also emit unburnt hydrocarbons and partially burnt, microscopic particles of soot. Cars using leaded petrol also give out lead fumes which have been proved to affect the mental development of children. Face masks such as this may filter out the larger particles of soot but are of little help against the other pollutants.
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