WHO recommendation cut off for noise in industrial city:: (A) 70 dB, (B) 60 dB, (C) 45 dB, (D) 120 dB
Answer is A. WHO Guidelines for Noise Exposure Specific Environment Critical Health Effects LA eq Time base LA Max fast 1) Outdoor Living area Serious annoyance daytime and evening.Moderate annoyance daytime & evening. 55 50 16 16 - - 2) Dwelling, Indoors Inside bed rooms Speech intelligibility & moderate annoyance.Sleep disturbance, night time. 35 30 16 8 45 3) Outside bedrooms Sleep disturbance, window open. 45 8 60 4) School classroom Speech intelligibility disturbance of information extraction, message communication. 30 During class - 5) School playground Annoyance 55 During play - 6) Hospital wards, rooms indoors Sleep disturbance night time. Sleep disturbance day time. 30 30 16 8 40 - 7) Industrial, commercial, shopping & traffic areas Hearing impairment 70 24 110 8) Ceremonies festivals events Hearing impairment 100 4 110 9) Headphones Hearing impairment (free - field values) 85 1 110