In this subtitle, the following terms have the meanings indicated. “Decibel” or “dB” means the unit of measurement of relative sound intensity equal to 20 times the logarithm to the base 10 of the ratio of the effective sound pressure to a reference pressure of 20 micronewtons per square meter. In formula, dB = 20 Log₁₀ P/P₀ where P is the average pressure of the measured sound, and P₀ indicates the reference pressure considered to be the weakest audible pressure a young ear can detect under ideal listening conditions. “Person” has the meaning stated in <cite data-path="|general|1|1|1-107|(a)">§ 1-107(a) {“Person: In general”}</cite> of the City Code’s <cite data-path="|general">General Provisions Article</cite>. Notwithstanding <cite data-path="|general|1|1|1-107|(b)">§ 1-107(b) {“Person: Exclusion”}</cite> of the <cite data-path="|general">General Provisions Article</cite>, in this subtitle “person” also includes, except as used in <cite data-path="|health|§9-218">§ 9-218 {“Penalties”} of this subtitle</cite>, a governmental entity or an instrumentality or unit of a governmental entity. “Sound level A” or “dB(A)” is the sound level in decibels, measured with a sound level meter that uses the A-weighting network or scale, as specified in ANSI S1.4 (“Specification for Sound Level Meters”), as amended from time to time. “Use” means any activity, occupation, business, or operation that is conducted on land or in or on a street, building, pier, wharf, or other structure. “Zone, commercial” means any of the following zoning districts established under the Baltimore City Zoning Code:all Commercial Zoning Districts; all OIC Office-Industrial Campus Zoning Districts; all BSC Bio-Science Campus Zoning Districts; all IMU-1 and IMU-2 Industrial Mixed-Use Zoning Districts; and all TOD Transit-Oriented Development Zoning Districts. “Zone, manufacturing” means any of the following zoning districts established under the Baltimore City Zoning Code:all I-1 Light Industrial Zoning Districts; all I-2 General Industrial Zoning Districts; and all MI Maritime Industrial Zoning Districts. “Zone, residential” means any of the following zoning districts established under the Baltimore City Zoning Code:all Residential Zoning Districts; and all Office-Residential Zoning Districts. City Code, 1976/83, art. 11, §230 (parts) Ord. 99-548 Ord. 16-581 Ord. 19-244 Ord. 22-125