Utah Code § 41-6a-1626

Mufflers -- Prevention of noise, smoke, and fumes -- Air pollution control
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devices.
(1)
(a) A vehicle shall be equipped, maintained, and operated to prevent excessive or unusual noise.
(b) A motor vehicle shall be equipped with a muffler or other effective noise suppressing system
in good working order and in constant operation.

(c) A person may not use a muffler cut-out, bypass, or similar device on a vehicle.
(2)
(a) The engine and power mechanism of a gasoline-powered motor vehicle may not emit visible
contaminants during operationunless:
(i) the engine of the motor vehicle is being warmed to the recommended operating temperature;
or
(ii) the motor vehicle is exempt from an emissions inspection under Section 41-6a-1642.
(b)
(i) As used in this Subsection (2)(b), "heavy tow" means a tow that exceeds the vehicle's
maximum tow weight.
(ii) A diesel engine manufactured on or after January 1, 2008, may not emit visible
contaminants during operation:
(A) except while the engine is being warmed to the recommended operating temperature or
under a heavy tow; or
(B) unless the diesel engine is in a vehicle with a manufacturer's gross vehicle weight rating in
excess of 26,000 pounds.
(iii) A diesel engine manufactured before January 1, 2008, may not emit visible contaminants
of a shade or density that obscures a contrasting background by more than 20%, for more
than five consecutive seconds:
(A) except while the engine is being warmed to the recommended operating temperature or
under a heavy tow; or
(B) unless the diesel engine is in a vehicle with a manufacturer's gross vehicle weight rating in
excess of 26,000 pounds.
(c) A person who violates the provisions of Subsection (2)(a) is guilty of an infraction and shall be
fined:
(i) not less than $50 for a violation; or
(ii) not less than $100 for a second or subsequent violation within three years of a previous
violation of this section.
(d) A person who violates the provisions of Subsection (2)(b) is guilty of an infraction and shall be
fined:
(i) not less than $100 for a violation; or
(ii) not less than $500 for a second or subsequent violation within three years of a previous
violation of this section.
(e)
(i) As used in this section:
(A) "Local health department" means the same as that term is defined in Section 26A-1-102.
(B) "Nonattainment area" means a part of the state where air quality is determined to exceed
the National Ambient Air Quality Standards, as defined in the Clean Air Act Amendments
of 1970, Pub. L. No. 91-604, Sec. 109, for fine particulate matter (PM 2.5).
(ii) Within a nonattainment area, for a second or subsequent violation of Subsection (2)(a) or (2)
(b), the court shall report the violations to the local health department at a regular interval.
(iii) If the local health department receives a notification as described in Subsection (2)(e)(ii),
and the local health department determines that the registered vehicle is unable to meet
state or local air emission standards, the local health department shall send notification to
the Motor Vehicle Division.
(3)
(a) If a motor vehicle is equipped by a manufacturer with air pollution control devices, the devices
shall be maintained in good working order and in constant operation.

(b) For purposes of the first sale of a vehicle at retail, an air pollution control device may be
substituted for the manufacturer's original device if the substituted device is at least as
effective in the reduction of emissions from the vehicle motor as the air pollution control
device furnished by the manufacturer of the vehicle as standard equipment for the same
vehicle class.
(c) A person who renders inoperable an air pollution control device on a motor vehicle is guilty of
an infraction.
(4) Subsection (3) does not apply to a motor vehicle altered and modified to use clean fuel, as
defined under Section 59-13-102, when the emissions from the modified or altered motor
vehicle are at levels that comply with existing state or federal standards for the emission of
pollutants from a motor vehicle of the same class.
(5) A violation of Subsection (1), (2), or (3) is an infraction.

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