This provision is an "objective emission" control and a "subjective" control. It can place a maximum sound level at a specific distance for the loudest operation. It can set a curfew, or it can be based on "noise disturbance" in residential zones. Los Angeles, CA (Section 113.01) has a time limit that applies only within 200 feet of any residential building. Chicago, IL (Section 11-4-2900) considers any noise it a noise disturbance if the activity occurs between 8pm to 8am. Salt Lake City, UT (Section 4.5.6) considers it a noise disturbance if the activities occur between 10 pm to 7 am and closer than 800 feet from a dwelling. Atlanta, GA (Section 74-137(a)(5)prohibits collection between 9pm and am on a weekend day or legal holiday, except by permit. In Maryland, refuse collection is exempt during daytime hours and must meet maximum land use levels [55 dB(A)] in residential zones at night. Note in some areas garbage trucks themselves play music to let residents know it is time to bring out their garbage.