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United States Code
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Title 42 — The Public Health and Welfare
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Chapter 85 — Air Pollution Prevention and Control
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Subchapter I — Programs and Activities
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Part C — Prevention of Significant Deterioration of Air Quality
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Subpart ii — visibility protection
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Subpt. i
clean air
Subpart ii — visibility protection
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§7491
Visibility protection for Federal class I areas
§7492
Visibility
‹
Subpt. i
clean air
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