LASSEN COUNTY AIR POLLUTION CONTROL DISTRICT

RULE 4:0 - RINGELMANN CHART

A person shall not discharge into the atmosphere from any single source of emission whatsoever any air contaminant for a period or periods aggregating more than three minutes in any one hour which is:

  1. As dark or darker in shade as that designated as No. 2 on the Ringelmann Chart, as published by the United State Bureau of Mines, or
  2. Of such opacity as to obscure an observer's view to a degree equal to or greater than does smoke described in subsection (a) of this Rule (Section 41701)