TONY CRADDOCK / SCIENCE PHOTO LIBRARY TONY CRADDOCK / SCIENCE PHOTO LIBRARY
Smog over Hong Kong. View across part of the city of Hong Kong, China, showing a deep photochemical smog. Various emissions from motor vehicles, particularly unburnt hydrocarbons, react with low- level ozone to form this brown, hazy smog. High levels of smog pose a very serious health hazard, especially to the old, the very young or those with existing respiratory complaints.
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