§ 10-357. Smoke, dust, dirt, and fly ash.

It shall be unlawful to discharge into the atmosphere from any single source of emission whatsoever any air contaminates for a period or periods aggregating more than four minutes in any one-half hour which are:

(1)

As dark or darker in shade as that designated as No. 2 on the Ringelmann Chart as published by the United States Bureau of Mines, which is hereby made a part of this article. However, the Umbrascope readings of smoke densities may be used when correlated with the Ringelmann Chart. A Ringelmann Chart shall be on file in the office of the building department.

(2)

Of such opacity as to obscure an observer's view to a degree equal to or greater than the smoke described in subsection (1) of this section, except when the emission consists only of water vapor. The quantity of gas borne or airborne solids shall not exceed 0.20 grain per cubic foot of the carrying medium at a temperature of 500 degrees Fahrenheit.

(Comp. Ords. 1985, § 35.058(G))