Correct Answer: 40 - 45 dec

Solution : The correct answer is 40 - 45 dec.

The higher levels of sound which is derogatory to human health is known as noise pollution or sound pollution. Sound is measured in Decibels. Noise pollution is usually caused by the transport noises, machinery functioning in industries, loud music etc. According to noise pollution rules, the permissible limits of noise are-

• Industrial area- 75 dB in day and 70 dB in night
• Commercial area- 66 dB in day and 55 dB in night
• Residential area- 55 dB in day and 45 dB in night.