railway RRB JE (CBT I + CBT II) Mock Test 2024 General Science Biology Ecology & Environment

Which of the following is correct regarding Central Pollution Control Board prescribed limit of BOD for the discharge of industrial and municipal waste waters into natural surface waters?

1
< 100 ppm
2
< 30 ppm
3
< 3.0 ppm
4
< 10 ppm
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