The Noise Pollution (Regulation and Control) Rules 2000 in India specify daytime (6 AM to 10 PM) ambient noise limit for industrial areas as:

• A 45 dB(A)
• B 55 dB(A)
• C 65 dB(A)
• D 75 dB(A) ✓

Explanation

Under Noise Pollution (Regulation and Control) Rules 2000, the ambient noise limits in dB(A) are: Industrial areas — 75 daytime, 70 nighttime; Commercial areas — 65 daytime, 55 nighttime; Residential areas — 55 daytime, 45 nighttime; Silence zones (near hospitals, educational institutions) — 50 daytime, 40 nighttime. Industrial areas have the highest permitted noise levels to account for inherent machinery noise, though occupational exposure limits within factories may differ under the Factories Act.

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

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