Md. Code, Environment § 3–101

(a) In this title the following words have the meanings indicated.

(b) “Environmental noise standard” means a goal for the limitation of noise, from all sources, that exists in a defined area under specified conditions.

(c) (1) “Noise” means the intensity, frequency, duration, and character of sound.

(2) “Noise” includes sound and vibration of subaudible frequencies.

(d) “Political subdivision” means a county or municipal corporation of this State.

(e) “Sound level limit” means the maximum allowable noise emission from a noise source in a defined area under specified conditions.

(f) “Source” means any person or property from which sound originates.