Question

The permissible noise level in industrial areas in India is

• A. 65 dB for day time and 55 dB at night
• B. 75 dB for daytime and 70 dB at night
• C. 55 dB for daytime and 45 dB at night
• D. 45 dB for daytime and 35 dB at night

Hint:

• Indian Noise Pollution (Regulation and Control) Rules, 2000, define ambient noise standards.
• Standards vary by area type (Industrial, Commercial, Residential, Silence Zone) and time (Day/Night).
• For Industrial Areas:
  • Day Time: 75 dB(A) Leq
  • Night Time: 70 dB(A) Leq
• For Commercial Areas: Day 65 dB(A), Night 55 dB(A).
• For Residential Areas: Day 55 dB(A), Night 45 dB(A).
• For Silence Zones: Day 50 dB(A), Night 40 dB(A).

Answer 1

The Correct Option is B

To answer the question, let's explore the permissible noise levels in industrial areas in India as defined by the country's regulations on environmental noise pollution.

1. Understanding the Concepts:

- Noise Pollution Regulations in India: The permissible noise levels in different zones (residential, commercial, industrial) in India are regulated by the Central Pollution Control Board (CPCB). These levels are designed to minimize the harmful effects of excessive noise on human health and the environment.

- Noise Levels in Industrial Areas: Industrial areas are typically categorized as high noise zones due to machinery, equipment, and operational activities. Therefore, the permissible noise levels are higher compared to residential and commercial zones. However, there are still limits to prevent excessive noise exposure.

2. Breakdown of the Given Options:

• Option 1: "65 dB for daytime and 55 dB at night": This is the correct answer. According to the CPCB guidelines, the permissible noise level in industrial areas is 75 dB during daytime (6:00 AM to 10:00 PM) and 70 dB at night (10:00 PM to 6:00 AM), which matches Option 2, not Option 1.
• Option 2: "75 dB for daytime and 70 dB at night": This is correct. The permissible noise level in industrial areas is 75 dB during the day and 70 dB at night as per the regulations outlined by the CPCB in India.
• Option 3: "55 dB for daytime and 45 dB at night": This is incorrect. These levels are too low for industrial areas. Such levels may be applicable in residential or quiet zones but not in industrial zones.
• Option 4: "45 dB for daytime and 35 dB at night": This is incorrect. These values are too low for industrial areas and typically apply to residential or silence zones.

3. Conclusion:

The permissible noise level in industrial areas in India is 75 dB during daytime and 70 dB at night, as per CPCB guidelines.

Final Answer:

The permissible noise level in industrial areas in India is 75 dB for daytime and 70 dB at night.