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Limit of BOD prescribed by Central Pollution Control Board for the discharge of industrial and municipal waste waters into natural surface waters is,

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

Correct answer: < 30 ppm

Solution

The Central Pollution Control Board has set the permissible limit of Biochemical Oxygen Demand (BOD) for discharge into natural surface waters at less than 30 ppm to ensure minimal pollution and maintain aquatic life.

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