Standard BOD is measured at

- 1
  
  $20^{o} C - 1 d a y$
- 2
  
  $25^{o} C - 3 d a y$
- 3
  
  $20^{o} C - 5 d a y$
- 4
  
  $30^{o} C - 5 d a y$

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