...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). (b) No owner shall cause, suffer,...

...shade as that designated as No. 2 on the Ringelmann chart, as published by the US 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) of this section." Section 24246. Provides...

...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 a degree equal to or greater than does smoke described in subsection (я) of this section. Directly involved...

...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...

...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...

...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 an observer's view to a degree equal to or greater than does smoke described in subsection (a) of this Rule. -13IV. Applicability...

...more than three minutes in any one hour which is (a) as dark or darker in shade than Ringelmann 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 Ringelmann No. 2 (i 24242). 2. A person shall not discharge...

...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...

...a shade or density equal to or darker than that designated as No. 2 on the Ringelmann Chart, 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 (1) of this regulation, exclusive of...

...nor shall any person obstruct, hamper, or interfere with any such inspection. EMISSIONS PROHIRITED SEC. 9. (a) (1) A person shall not discharge into...contaminants contains less than ten one-hundredths pound of partieulate matter per one thousand pounds of dry exhaust gas, adjusted to 12 per centum carbon dioxide...