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Note: Explanation of identified level for hearing loss: The exposure period that results in hearing loss at the identified level is a period of forty years. Code:

(a) Since different types of activities appear to be associated with different levels, identification of a maximum level for activity interference may be difficult except in those circumstances where speech communication is a critical activity.

(b) Based on lowest level.

(c) Based only on hearing loss.

(d) An Leq(8) of 75 dB can be identified in these situations so long as the exposure over the remaining sixteen hours per day is low enough to result in negligible contribution to the twenty-four-hour average, that is, no greater than an Leq of 60 dB.

unpopulated land

Note: Explanation of identified level for hearing loss: The exposure period that results in hearing loss at the identified level is a period of forty years. Code:

(a) Since different types of activities appear to be associated with different levels, identification of a maximum level for activity interference may be difficult except in those circumstances where speech communication is a critical activity.

(b) Based on lowest level.

(c) Based only on hearing loss.

(d) An Leq(8) of 75 dB can be identified in these situations so long as the exposure over the remaining sixteen hours per day is low enough to result in negligible contribution to the twenty-four-hour average, that is, no greater than an Leq of 60 dB.

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