Q. Which among the following is the upper limit of sound advice of Central Pollution Control Board (CPCB) for residential areas?
Answer: 55 Decibels
Notes: Central Pollution Control Board (CPCB) has declared the permissible noise level in India for different areas. In industrial areas, it is 75 dB (daytime) and 70 dB (night). In commercial areas, it is 65 dB and 55 dB respectively and in residential areas it is 55 dB and 45 dB.

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