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" 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. "
Air Pollution: Hearings Before Subcommittee No. 2...90-1, on H.R. 6981, H.R ... - Side 4
av United States. Congress. House. District of Columbia - 1967 - 103 sider
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Hearings, Reports and Prints of the Senate Committee on Armed Services

United States. Congress. Senate. Committee on Armed Services - 1975
...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,...
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Occupational Health and Safety Legislation: A Compilation of State Laws and ...

Victoria M. Trasko, United States. Occupational Health Program - 1954 - 315 sider
...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...
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Proceedings

1963
...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...
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Clean Air: Hearings Before a Special Subcommittee on Air and Water Pollution ...

United States. Congress. Senate. Committee on Public Works. Subcommittee on Air and Water Pollution - 1964 - 852 sider
...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...
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Clean Air: Hearings Before a Special Subcommittee on Air and Water Pollution ...

United States. Congress. Senate. Committee on Public Works - 1964 - 1408 sider
...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...
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A Compilation of Selected Air Pollution Emission Control Regulations and ...

Robert A. Taft Sanitary Engineering Center - 1965 - 123 sider
...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...
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A Digest of State Air Pollution Laws

United States. Division of Air Pollution - 1966
...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...
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Clean Air Act Amendments of 1966: Hearing, Eighty-ninth Congress, Second ...

United States. Congress. House Interstate and Foreign Commerce, United States. Congress. House. Committee on Interstate and Foreign Commerce. Subcommittee on Public Health and Welfare - 1966 - 126 sider
...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...
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Interstate Air Pollution Study: Phase II Project Report, Volumer 1-8

1966
...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...
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Air Pollution: Hearings Before Subcommittee No. 2, Ninetieth Congress, First ...

United States. Congress. House. Committee on the District of Columbia - 1967 - 103 sider
...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...
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