According to the World Health Organization (WHO) guidelines on community noise, the recommended noise level for outdoor living areas in residential zones to prevent serious annoyance during the daytime is 55 dB(A).
As per the WHO the safe noise level for a city is
Asked in UPPSC Upper Mains 2010 · Topic: Pollution (Noise Pollution: Sources, impacts on health & wildlife, permissible limits, mitigation.)
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