Table 1
| ||
---|---|---|
Daytime Hours
7:00 a.m. to 8:00 p.m.
|
Nighttime Hours
8:00 p.m. to 7:00 a.m.
| |
Commercial
|
70
|
60
|
Industrial
|
85
|
60
|
Residential
|
65
|
50
|
Mixed-use indoor
|
65
|
40
|
All limits expressed in dba. Measurements to be taken at real
property line of the receiving property.
| ||
*(Decibel levels are close approximations - levels to be set
after enforcers are educated and multi-week noise level recordings
are reviewed.)
|
Table 2
| ||
Motor Vehicles
| ||
Sound Level Limit
| ||
These requirements apply to the total sound from a vehicle or
combination of vehicles and shall not be construed as limiting or
precluding the enforcement of any other provisions of this article
relating to motor vehicle mufflers for noise control.
| ||
(1)
|
Motorcycles. No person shall operate a motorcycle which exceeds
99 dB, measured in accordance with SAE Stationary Test Method J1287
or similar department-approved method.
| |
(2)
|
No person shall operate a motor vehicle having a manufacturer's
gross vehicle rating of less than 6,000 pounds, except a motorcycle,
which exceeds 95 dB measured 20 inches (508 mm) from the exhaust outlet.
The measured exhaust system sound level of a stationary vehicle shall
be the highest reading obtained during the test, disregarding unrelated
peaks due to extraneous ambient noise. When there is more than one
exhaust outlet, the reported sound level shall be for the loudest
outlet. When there is more than one exhaust outlet extending from
a single muffler, separated by less than 12 inches (305 mm), measurements
shall not be made on the outlet furthest from the side of the vehicle.
| |
(3)
|
No person shall operate a motor vehicle having a manufacturer's
gross vehicle weight rating of at least 6,000 pounds which exceeds
93 dB, measured 25 feet (7.6 m) from the side of the vehicle. The
sound-level meter shall be observed during the full cycle of engine
acceleration-deceleration, and the measured sound-level reading shall
be the highest value obtained during this cycle, excluding unrelated
peaks due to extraneous ambient noise. When there is more than one
outlet, the sound level for each side of the vehicle shall be measured,
and the reported sound level shall be the average of the two highest
readings within 1 dB of each other on the louder side.
| |
(4)
|
All motor vehicles shall have a ninety-day grace period from
the date of publication of this section to comply with the vehicle
noise emission regulations herein.
|
Table 3
| |
Method of Sound Measurement
| |
Indoor/Outdoor
| |
Whenever portions of this article prohibit sound over a certain
decibel limit, measurement shall be made with a Type 1 or Type 2 calibrated
sound-level meter utilizing the A-weighting scale and the slow meter
response as specified by the American Standards Association. Measurements
recorded shall be taken so as to provide a proper representation of
the sound being measured. The microphone of the meter shall be positioned
so as not to create any unnatural enhancement or diminution of the
measured sound. A windscreen for the microphone shall be used. Traffic,
aircraft, and other transportation noise shall not be considered in
taking measurements, except where such background noise interferes
with the noise being measured and cannot reasonably be distinguished
from the primary noise. Measurements of sound generated shall be taken
from the curbline of the nearest public street to the property where
the sound is generated and taken toward the source of the sound. In
the event that there is not at least 50 feet of distance from the
building in which sound is being generated and from which sound is
being measured, then measurements shall be taken from the City of
Las Vegas curbline opposite the said building of the nearest public
street to the property where the sound is generated.
| |
With regard to motor vehicles to include motorcycles, measurements
are to be taken by SPL meter:
| |
(1)
|
At idle speed;
|
(2)
|
At specified RPM;
|
(3)
|
At a distance of four feet from where exhaust exits the tailpipe;
or
|
(4)
|
Per SPL meter manufacture recommendations.
|