The purpose of this chapter is to protect, preserve, upgrade and regulate the environmental quality of the city. This will be accomplished by prohibiting certain environmental conditions which may exist and are identified as a threat to the health, safety and welfare of the general public or to the aesthetic characteristics of the city and to provide for the administration and enforcement thereof. (Ord. 90-21 § 2, 1990; Ord. 80-59 § 2 (part), 1980.)