§ 9-205. In general.

(a) Prohibited conduct.

(1) No person may cause or permit a sound level that exceeds the applicable level specified in this subtitle.

(2) No person may cause or permit a sound level from the construction, repair, or demolition of a structure or street that exceeds any applicable level set by a rule or regulation of Commissioner, except in accordance with a temporary exemption permit or as necessary to do emergency work.

(3) No person may operate a motor vehicle so as to exceed any applicable sound level set by a rule or regulation of the Commissioner.

(4) No person may use a vehicle horn except:

(i) as reasonably necessary to assure safe operation; or

(ii) as an emergency warning signal.

(b) Measurements.

For sound levels set in this subtitle, measurements must be made with instruments calibrated by means of accepted acoustical techniques to an accuracy of plus or minus 1 dB(A).