The IRC recommendation for maximum Noise Pollution (road traffic) in residential areas is:
Choose the correct answer
90 dB(A) for all areas
55 dB(A) day / 45 dB(A) night for residential areas (CPCB Noise Pollution Rules 2000)
No standard exists
75 dB(A) at all times
Correct Answer
B. 55 dB(A) day / 45 dB(A) night for residential areas (CPCB Noise Pollution Rules 2000)
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Central Pollution Control Board (CPCB) / Noise Pollution Rules 2000: Day (6AM–10PM): Residential = 55 dB(A), Commercial = 65, Industrial = 75, Silence zone = 50. Night (10PM–6AM): Residential = 45, Commercial = 55, Industrial = 70, Silence zone = 40 dB(A). Mitigation: noise barriers (walls, berms, plantations) reduce by 5–15 dB(A).
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