Question
Chemistry Question on Environmental pollution
Sounds above what level are considered hazardous noise pollution?
A
above 80 dB
B
above 30 dB
C
above 150 dB
D
above 120 dB.
Answer
above 80 dB
Explanation
Solution
Noise level are expressed on a logarithmic scale of decibels. The baseline noise levels in the community vary around 40 dB. International standards prescribe a maximum of 50 dB for day and 40 dB for night time in a residential area. Noise over 115 dB is regarded as highly avoidable. The World Health Organization (WHO) recommends an industrial noise limit of 75 dB.