green lung

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green lung (plural green lungs)

  1. An area of natural parkland within an urban region, supposed to replenish the air with oxygen.
    • 2006, Christof Mauch, Nathan Stoltzfus, Douglas R. Weiner, Shades of green: environmental activism around the globe (page 76)
      The Magaliesberg became something of a green lung to which people escaped, particularly over weekends.
    • 2007, United Nations Environment Programme, Beijing 2008 Olympic games: an environmental review, page 74:
      After the Games, the Park will remain protected, serving as a green lung for the surrounding boroughs and the Olympic Village residential area.