U.S. Code of Federal Regulations

Regulations most recently checked for updates: Sep 16, 2025

All TitlesTitle 49Chapter IIIPart 325Subpart E - Subpart E—Measurement of Noise Emissions; Stationary Test
§ 325.51 - Scope of the rules in this subpart.
§ 325.53 - Site characteristics; stationary test.
§ 325.55 - Ambient conditions; stationary test.
§ 325.57 - Location and operation of sound level measurement systems; stationary test.
§ 325.59 - Measurement procedure; stationary test.
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