§ 153.255  SMOKE, DUST, DIRT, AND FLY ASH.
   (A)   It shall be unlawful to discharge into the atmosphere from any single source of emission whatsoever any air contaminator for a period or periods aggregating more than three minutes in any 60 minutes which is:
      (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 and which is hereby made a part of this subchapter.  The umbrascope readings of smoke densities, however, may be used when correlated with the Ringelmann Chart; and
      (2)   More than 40% opacity which obscures an observer’s view to a degree equal to or greater than the smoke described in division (A)(1) above, except when the emission consists of only water vapor.
   (B)   The emission of particulates shall not exceed 0.20 grains per cubic foot of the carrying medium at a temperature of 500°F.
(1993 Code, § 154.205)  (Ord. 84-1, passed 1-3-1984)  Penalty, see § 153.999