Level of noise recommended in most countries is*1 point30-40 dB95-100 d B85-90 d B75-80d B

To determine the level of noise recommended in most countries, we can analyze the given options, which are decibel (dB) levels.

1. Understanding Noise Levels: Noise levels are measured in decibels (dB), where lower numbers indicate quieter sounds. For example, 30-40 dB is akin to a whisper or a quiet room, while 95-100 dB can resemble a loud concert or a chainsaw.

2. Common Recommendations: Various health organizations, like the World Health Organization (WHO) and local governmental agencies, generally recommend noise levels in residential areas to be around 30-50 dB to minimize disturbance to sleep and concentration.

3. Evaluation of Options:

   • 30-40 dB: This range is typically considered very quiet and conducive to peaceful living conditions.
   • 75-80 dB: This level is still tolerable but might be considered noisy in residential contexts.
   • 85-90 dB: This level is quite loud and can lead to hearing damage with prolonged exposure.
   • 95-100 dB: This is very loud and generally deemed unsafe for health, especially in concentrations over time.

4. Conclusion and Recommendation: The best answer based on general recommendations for residential noise levels is 30-40 dB, as this range promotes a quiet and healthy living environment.

Final Answer

30-40 dB is the recommended level of noise in most countries.