4-6-5: PROHIBITED CONDITIONS:
   A.   Emission Of Dense Smoke: It shall be unlawful for any person to cause, suffer or allow to be emitted into the open air from any fuel-burning equipment, internal combustion engine, railroad locomotive, vehicle, premises or open fire, smoke the shade or appearance of which is equal to or darker than No. 3 of the Ringlemann Chart. Nothing contained herein shall be construed as in any way limiting the city's power and authority to abate, in accordance with the provisions of law, any nuisance which may result from the emission of light smoke and gases which cannot be located or classified upon and by a Ringlemann Chart. The provisions of this subsection shall not apply to smoke, the shade or appearance of which is equal to but not darker than No. 3 of the Ringlemann Chart for a period or periods aggregating five (5) minutes in any thirty (30) minutes, when building a new fire, cleaning flues or when breakdown occurs such as to make it evident that the emission was not reasonably preventable.
   B.   Escape Of Cinders, Soot, Dust, Fly Ash, Noxious Gases, Fumes, Gases And Odors: It shall be unlawful for any person to permit or cause the escape into the open air of such quantities of cinders, soot, dust, fly ash, noxious gases, fumes, gases and odors, in such place or manner as to be detrimental to the public or to endanger the health, comfort and safety of the public, or in such manner as to cause injury or damage to property or business. The escape of such matter is declared to be a public nuisance and shall be abated in the manner provided by law. (Ord. 1945, 7-14-1953)