§ 11-5-6. Exemptions.

The following uses and activities shall be exempt from the provisions of this chapter:

(1)

Noises of safety signals, warning devices, and emergency pressure relief valves.

(2)

Noises resulting from any authorized police, fire or emergency vehicle, when responding to an emergency call or acting in time of emergency.

(3)

Noises resulting from emergency work as defined in section 11-5-2.

(4)

Any other noise resulting from activities of a temporary duration permitted by law and for which a license or permit therefor has been granted by the city in accordance with section 11-5-7.

(5)

Any aircraft operated in conformity with, or pursuant to federal law, federal air regulations, and air traffic control instruction used pursuant to and within the duly adopted federal air regulations. Any aircraft operating under technical difficulties, in any kind of distress, under emergency orders of air traffic control or being operated pursuant to and subsequent to the declaration of an emergency under federal air regulations.

(6)

Any railroad operated in conformity with, or pursuant to federal law or regulations.

(7)

Work necessary to restore and maintain services provided by public service companies, the rail rapid transit system and the city.

(8)

Noises resulting from the operation of rail rapid transit systems, provided the noise does not exceed the noise level set forth in subsection 11-5-5(e) of this chapter applicable on July 1, 1977 at the point at which the noise occurs.

(9)

Interstate motor carriers, and medium and heavy trucks manufactured and operated in accordance with federal noise standards. Such vehicles may not be operated with a defective muffler or with tampered or missing noise control devices.