40 CFR § 201.14
Standard for retarders
June 9, 2020
Effective January 15, 1984, no carrier subject to this regulation shall operate retarders that exceed an adjusted average maximum A-weighted sound level of 83 dB at any receiving property measurement location, when measured with fast meter response in accordance with Subpart C of this part.
[45 FR 1263, Jan. 4, 1980; 47 FR 14709, Apr. 6, 1982]
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