Under the Noise Pollution (Regulation and Control) Rules, 2000, the daytime (6 AM to 10 PM) ambient noise standard for a residential zone in India is:

• A 45 dB(A)
• B 50 dB(A)
• C 55 dB(A) ✓
• D 75 dB(A)

Explanation

The Noise Pollution Rules 2000 specify daytime ambient noise standards: industrial zone 75 dB(A), commercial zone 65 dB(A), residential zone 55 dB(A), and silence zone 50 dB(A). Nighttime limits are 10 dB(A) lower. Option D is the industrial daytime limit, a common distractor. Silence zone applies to areas near hospitals and courts, not general residential areas.

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

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