It shall be unlawful for any person to keep, store or possess in any building used for residential, assembly or office occupancy and quantity of hazardous chemicals as defined by this section without a permit except materials in forms prescribed by the official United States Pharmacopeia. For the purposes of this section hazardous chemicals requiring a permit shall include any of the following:
(1) Any material classified by the United States Department of Transportation as a class A explosive or a class A poison.
(2) Any material classified by the National Fire Protection Association recommended system for the identification of the fire hazards of materials, NFPA #704-M, that have a health hazard rating of three or four or that have a reactivity rating of two, three or four.
(3) Any material not classified by either system but which possesses the same or similar characteristics of being unstable or highly toxic as those materials covered by paragraphs (1) and (2) above. (1975 L.M.C., ch. 23, § 1.)