(A) It shall be unlawful to cause or permit the emission of dense smoke from any fire, chimney, engine, oil burner, or any other agency in the village so as to cause annoyance or discomfort to the residents thereof.
(B) For the purpose of testing and grading the density of smoke, the Ringelmann Smoke Chart as published and used by the United States Geological Survey, shall be and is hereby adopted as a standard for such grading. SMOKE shall be defined as and declared to be DENSE when it is of a degree of density of number three of said chart, or greater, for more than six minutes in any one hour; whether such period of time is consecutive or not.
('70 Code, § 5.3.13) Penalty, see § 94.99