Every person is guilty of a misdemeanor who:
Spark arrester, as used in this section, is as defined in Section 4442 of the Public Resources Code.
Spark arresters attached to the exhaust system of engines on equipment or vehicles, as described in this section, shall not be placed or mounted in such a manner as to allow flames or heat from the exhaust system to ignite any flammable material.
Motortrucks, truck tractors, buses, and passenger vehicles, except motorcycles, are not subject to the provisions of paragraph (2) of subdivision (a) if the exhaust system is equipped with a muffler as defined in the Vehicle Code.
Ca. Health and Saf. Code § 13005