It is unlawful for the owner or occupant of abutting private property to allow the accumulation of litter on sidewalks or planting strips, whether such litter is deposited by such owner or occupant or not. This provision shall not apply to the law enforcement officer when removing the contents of a building to the sidewalk or planting strip pursuant to an eviction ordered by the superior court, or to firefighters placing debris on the sidewalk or planting strip in the course of extinguishing a fire or explosion. (Ord. 4276 § 4, 1988.)