Question

What level of noise is considered permissible in human habitats?

• A. Upto 50 decibels
• B. Less than 40 decibels
• C. Upto 30 decibels
• D. Less than 20 decibels

Answer 1

The Correct Option is A

Step 1: Understand the question
The question asks about the permissible level of noise in human habitats. Noise levels are usually measured in decibels (dB), and environmental and health agencies prescribe safe limits to prevent disturbances and health hazards.

Step 2: General permissible limits
In most environmental standards, including those followed in India and by international health agencies, the permissible noise level in residential or human habitats is up to about **50 decibels** during the daytime. This level is considered safe and tolerable for normal human activity without causing stress, hearing problems, or disruption of daily life.

Step 3: Why higher levels are harmful
- Exposure above 70–80 dB for long periods can cause health issues like stress, sleep disturbances, and even hearing impairment. - Noise above 100 dB (such as from loud machinery or aircraft engines) can cause immediate hearing damage. - Therefore, maintaining noise at or below 50 dB in living areas is essential for human well-being.

Step 4: Final justification
Hence, the standard permissible level in residential or human habitats is considered up to 50 dB.

Final Answer: The correct option is (A) Upto 50 decibels.