Question

What is the recommended level of fluoride in drinking water?

• A. 0.2 to 0.5 mg/L
• B. 0.5 to 0.8 mg/L
• C. 0.8 to 1.2 mg/L
• D. 1.2 to 2.0 mg/L

Hint:

Recommended fluoride is 0.5 to 0.8 mg/L; maximum permissible is 1.5 mg/L.

Answer 1

The Correct Option is B

Step 1: Fluoride in drinking water needs a narrow balance. Too little leads to dental caries, while too much causes dental and skeletal fluorosis.

Step 2: As per Park, the level of fluoride recommended in drinking water in India is \(0.5\) to \(0.8\ \text{mg/L}\). This corresponds to option b.

Step 3: The maximum permissible upper limit is \(1.5\ \text{mg/L}\); beyond this, fluorosis risk rises sharply, which is why higher ranges in the options are incorrect.

Step 4: Therefore the recommended range is 0.5 to 0.8 mg/L, option b.