CPCB Night Time Noise Pollution Limits Explained

Noise pollution refers to unwanted or disturbing sounds that can negatively impact human health and environmental well-being. Regulatory bodies like the Central Pollution Control Board (CPCB) in India set specific permissible limits for noise levels to protect public health.

Understanding Noise Standards

The CPCB categorizes noise levels based on the time of day and the type of area (e.g., industrial, commercial, residential, silent zones). Generally, noise limits are stricter during the night time compared to the day time to ensure peace and allow for rest.

CPCB Night Time Permissible Limit

The question asks for the permissible limit of noise pollution prescribed by the CPCB during night time. Let's analyze the options in the context of CPCB standards:

• The CPCB designates specific decibel (dB) limits for different zones and times.
• For Silent Zones (areas like hospitals, educational institutions, courts, and religious places), the CPCB typically prescribes a lower noise limit during the night to maintain a quiet environment.
• According to CPCB standards, the permissible noise level for Silent Zones during night hours (usually 10:00 PM to 6:00 AM) is 35 dB.
• Other categories, like Residential Areas, have a night-time limit of 45 dB.
• The option "Less than 40 dB" aligns closely with the stringent limit set for Silent Zones at night (35 dB), representing the quietest permissible level.

Conclusion on Night Time Noise Level

Considering the options provided and the typical CPCB standards, particularly for sensitive areas like Silent Zones, a level Less than 40 dB represents the most appropriate and stringent permissible limit for noise pollution during night time.

Therefore, the CPCB prescribed permissible limit during night time, especially considering sensitive zones, is accurately represented by levels below 40 \text{dB}.