According to WHO standards, the permissible limit of fluoride in drinking water is:

• A 0.5 mg/L
• B 1.0 mg/L
• C 2.0 mg/L
• D 1.5 mg/L ✓

Explanation

WHO guidelines set the permissible limit of fluoride in drinking water at 1.5 mg/L. India's Bureau of Indian Standards sets the desirable limit at 1.0 mg/L and permissible limit at 1.5 mg/L in absence of alternative sources. Excess fluoride (>1.5 mg/L) causes dental and skeletal fluorosis, while deficiency (<0.5 mg/L) leads to increased dental caries.

Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.