Which one of the following statements is not true?
1. | Concentration of dissolved oxygen below 5 ppm is good for the growth of fish. |
2. | Clean water would have a BOD value of less than 5 ppm. |
3. | Oxides of sulphur, nitrogen, and carbon are the most widespread air pollutant. |
4. | pH of drinking water should be between 6.5-8.5. |
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