Which one of the following statements is not true?
- A$pH$ of drinking water should be between $5.5 - 9.5$.
- BConcentration of $DO$ below $6 \ ppm$ is good for the growth of fish.
- CClean water would have a $BOD$ value of less than $5 \ ppm$.
- DOxides of sulphur,nitrogen and carbon are the most widespread air pollutants.
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