Sounds above what level are considered hazardous noise pollution?
Correct answer: A. Above 80 dB
- A. Above 80 dB
- B. Above 30 dB
- C. 50 dB
- D. 20 dB
Explanation
The level at which sounds are considered hazardous noise pollution depends on both the intensity of the sound and the duration of exposure. Sound intensity is typically measured in decibels (dB). Prolonged exposure to sound levels of 85 decibels or above can potentially lead to hearing damage over time. Noise level is 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.
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About Man and His Environment
Ecosystems include biotic and abiotic components, food chains and webs, energy flow, nutrient cycles, populations and ecological relationships. Pollution and conservation cover air, water, soil and noise pollution, their effects on organisms, biodiversity loss, protected areas, sustainable resource use and methods for reducing environmental damage.
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