![]() NOTE: Authority and reference cited: Section 142.3, Labor Code. (d) Exposure to impulsive or impact noise should not exceed 140 dB peak sound pressure level. (c) If the variations in noise level involve maxima at intervals of 1 second or less, the noise is to be considered continuous. With the dB(A) filter the sound level meter is less sensitive to very. Mixed exposure should be considered to exceed the limit value.Ĭn indicates the total time of exposure at a specified noise level,Īnd Tn indicates the total time of exposure permitted at that level. Download and print Sound Pressure Level - db(A), dB(B) and dB(C) criteria chart. Sounds between 110 and 120 dB are considered unsafe for human hearing. Decibel levels ranging from 120 to 140 dB are very dangerous to human hearing and also painful. If the sum of the followingįractions: C1/T1 + C2/T2. Decibel Level Chart of Common Sounds Painful & Dangerous. Their combined effect should be considered, rather than the Of two or more periods of noise exposure of different levels, 0.25ġ When the daily noise exposure is composed (dBA) minutes) hours (dBA) minutes) hoursĩ0. Table N-1 Permissible Noise Exposure 1 Permitted Duration Permitted Duration If such controls fail to reduce sound levels within the levels of the table, personal protective equipment shall be provided and used to reduce sound levels within the levels of the table. (b) When employees are subjected to sound levels exceeding those listed in Table N-1 of this section, feasible administrative or engineering controls shall be utilized. (a) Protection against the effects of noise exposure shall be provided when the sound levels exceed those shown in Table N-1 of this section when measured on the A-scale of a standard sound level meter at slow response. Control of Noise Exposure Return to index General Industry Safety OrdersĪrticle 105. A whisper is about 30 dB, normal conversation is about 60 dB, and a motorcycle engine running is about 95 dB.
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