Arizona Revised Statutes

Ariz. Rev. Stat. § 28-955 (2026)

Mufflers; noise and air pollution prevention; emissions control devices; civil penalty; exception

✓ current as of May 2026

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A. A motor vehicle shall be equipped at all times with a muffler that is in good working order and that is in constant operation to prevent excessive or unusual noise.

B. A person shall not use a muffler cutout, bypass or similar device on a motor vehicle on a highway.

C. The engine and power mechanism of a motor vehicle shall be equipped and adjusted to prevent the escape of excessive fumes or smoke.

D. Beginning with motor vehicles and motor vehicle engines of the 1968 model year, motor vehicles and motor vehicle engines shall be equipped with emissions control devices that meet the standards established by the director of environmental quality.

E. A person who violates this section is subject to a civil penalty of at least one hundred dollars.

F. This section does not apply to an electrically powered motor vehicle.

Notes of Decisions

Cited in 2 cases, 1974–1981 · leading case: Delarosa v. State, 518 P.2d 582 (Ariz. Ct. App. 1974).

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Delarosa v. State, 518 P.2d 582 (Ariz. Ct. App. 1974). · cites it 3× “” (Emphasis added) A.R.S. § 28-955 deals with state requirements on mufflers and ignition controls.”

Bill Moore Motor Homes, Inc. v. State, 629 P.2d 1025 (Ariz. Ct. App. 1981). · cites it 3× “A.R.S. § 28-955 deals with noise control (mufflers) and emissions controls.”

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