Durham Sec. 26-23 sets decibel limits: 60 dBA daytime (8 AM to 11 PM) and 50 dBA nighttime (11 PM to 8 AM). Measured at the property line with A-weighted ANSI sound meters.
Sec. 26-23 of the Durham Code of Ordinances establishes specific sound level limits measured in decibels using the A-weighted frequency network (dBA) as specified by the American National Standards Institute (ANSI). The daytime limit is 60 dBA from 8 AM to 11 PM, and the nighttime limit is 50 dBA from 11 PM to 8 AM. These limits apply uniformly across all zoning districts, unlike many cities that differentiate between residential, commercial, and industrial zones. Acoustical consultants have noted that Durham does not specify whether fast or slow time weighting should be used for sound level meter readings, which can affect measurement results. The 60 dBA daytime limit is equivalent to normal conversation volume, while the 50 dBA nighttime limit is equivalent to quiet conversation. Measurements are taken at the property line of the affected party.
Exceeding the decibel limits is a misdemeanor offense. First-time violators receive no warning and are referred to the Durham County Misdemeanor Diversion Program or issued a citation. Court appearance is required. Fines of up to $500 and up to 30 days jail time may apply under N.C.G.S. 14-288.4(a)(2).
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