It is unlawful for any person to maintain a public nuisance. Anything which is injurious to health or indecent or offensive to the senses, or which interferes with the comfortable enjoyment of life or property or anything which unlawfully obstructs the free passage or use in a customary manner of any public place, street, sidewalk or alley in the city, is a public nuisance and subject to summary abatement. [Code 2006 § 10-1-5].