...contaminant which is (1) darker in shade than smoke designated as No. 1 on the Ringelmann Chart. or (2) of such opacity as to obscure an observer's view to a degree greater than does smoke designated as No. 1 on the Ringelmann Chart (when used as * measure of opacity)....

...designated as No. 2 on the Ringelmann Chart, as published by the United States Bureau of Mines, or (fe) Of such opacity as to obscure an observer's view to...or greater than does smoke described in subsection (я) of this section. Directly involved was subdivision (b] relative to opacity of emission. The Appellate...

...more than three minutes In any one hour which la (a) as dark or darker In shade than Rlngelmann No. 2, or (b) of such opacity as to obscure an observer's...view to a degree equal to or greater than does smoke as dark as Rlngelmann Ho. 2 (I 24242). 2. A person shall not discharge from any sourch such quantities...

...more than three minutes In any one hour which it (a) as dark or darker in shade than Ringelmann Ho. 2, or (b) of such opacity as to obscure an observer's view to a degree equal to or greater than does amok* as dark as Rlngelmann No. 2 (I 24242). 2. A person shall not discharge from any sourch such quantities...

...duration in any one hour F* is as dark or darker than Ringelmann No. 2 or, of such opacity as to mre an observer's view to a degree equal to, or greater than does smoke «rk as Ringelmann No. 2. t Tfce Department shall, in addition to powers and duties elsewhere têt...

...darker in shade as that designated as No. 2 on the Rlngelmaim Chart, as published by the United States Bureau of Mines, or b. Of such opacity as to obscure...than does smoke described in subsection (a) of this Rule. -13IV. Applicability A. Sources Dome stc installations ; apartment house, office building, school,...

...single source of emission of any air contaminant which is as dark or darker than Rlngelmann No. 2 and of such opacity as to obscure an observer's view to a degree equal to or greater than Ringelmann No. 2 for a. period or periods aggregating more than three minutes in one hour is prohibited....

...sixty minutes air contaminants of a shade or density not darker than No. 2 on the Ringelmann Chart. 2. Of such opacity as to obscure an observer's view to a degree not greater than does smoke described in subsection C (1) of this regulation. 3. Where the presence...

...fifteen-minute period smoke the shade or density of which is less than No. 2 of the Ringelmann Chart, or of such opacity as to obscure an observer's view to a degree less than does smoke of No. 2 Ringelmann density, may be emitted. These permitted emissions shall not...

...darker in shade as that designated as No. 2 on the Ringelmann Chart, as published by the United States Bureau of Mines, or b. Of such opacity as to obscure...than does smoke described in subsection (a) of this Rule. RULE 51. NUISANCE. A person shall not discharge from any source whatsoever such quantities of...