COLUSA COUNTY AIR POLLUTION CONTROL DISTRICT
REGULATION II - PROHIBITIONS
RULE 2.13 - VISIBLE EMISSIONS
As provided by Section 41701 of the California Health and Safety Code, a person shall not discharge into the
atmosphere from any single source of emissions whatsoever, any air contaminants for a period or periods aggregating
more than three minutes in any one hour which is:
a. As dark or darker in shade as that designated as No. 2 on the Ringlemen Chart, as published by the United States Bureau of Mines; or
b. Of such opacity as to obscure an observer's view to a degree equal to or greater than does smoke described in subsection a., above.