Biological Oxygen Demand, 1976 to 2000

Unrestricted

Caption

Biological Oxygen Demand, 1976 to 2000

Summary

This map shows regional levels of organic pollution of freshwater in 1976-1990 and in 1991-2000, using biological oxygen demand as an indicator of organic pollution.

Source

United Nations Environment Programme / GRID-Arendal[1]

Cartographer/Designer: Philippe Rekacewicz, UNEP/GRID-Arendal

Primary Source:

  • Global Environment Monitoring System (GEMS)
  • Freshwater Quality Programme, UNEP, 2001.

Copyright

© 2006 UNEP / GRID-Arendal

Licensing

Used with permission.

For use constraints, see [2].

Series

This map is one in a series For a listing with flyovers, see Series:UNEP / GRID-Arendal.