DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY
Smog over the city. View across the city of Adelaide, Australia, showing a dense layer of smog in the air. This photograph was taken toward the end of the morning commuter 'rush hour'. Photochemical smog is a result of the action of sunlight on pollutants such as car exhaust fumes. Phytotoxic chemicals such as ozone and peroxyacetyl nitrates (PANs) are produced. These are irritant to humans, and toxic to plants in very low concentrations. Smog levels are increasing in many countries, even those with strict emission control legislation. This is due to the sheer volume of motor vehicles on the roads.
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