Turbidity, one of the important water quality parameters, is measured in

AColour units

BPH units

CNTU ✓ Correct

DMicrogram per cubic metre

Correct answer: (C) NTU

Explanation

Turbidity is measured in nephelometric turbidity units.

Colour units describe the tint of water, not its cloudiness.

The pH scale measures acidity or alkalinity, not turbidity.

Micrograms per cubic metre express airborne concentrations, not water turbidity.

Turbidity gauges how much suspended matter scatters light passing through water.

High turbidity can shelter pathogens and reduce the effectiveness of disinfection.

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