The emission of dense or thick black or gray smoke or cinders from any smokestack or chimney of any stationary engine, locomotive, steam boiler, incinerator, furnace or building of any description within the limits of the City is declared to be a public nuisance, and it shall be the duty of the owner, agent, lessee or occupant thereof to abate the same. Nothing contained in this section shall be construed to apply to the chimneys of buildings used exclusively for private residences.
(1979 Code § 8.24.190)