# Citation lookup: 40 CFR 52.21 20 matching passages. ### 1. 40 CFR § 52.21 *Federal (CFR / EPA) · convenience · official* > § 52.21 Prevention of significant deterioration of air quality. (a)(1) Plan disapproval. The provisions of this section are applicable to any State implementation plan which has been disapproved with respect to prevention of significant deterioration of air quality in any portion of any State where the existing air quality is better than the national ambient air quality standards. Specific disapprovals are listed where applicable, in subparts B through DDD… **Full text:** https://data.regpermit.com/chunk/cfr%2F40%2F52%2F21%23p0%400-c1f86cc4e25c ### 2. 40 CFR § 52.21 *Federal (CFR / EPA) · convenience · official* > § 52.21 Prevention of significant deterioration of air quality. (2) Applicability procedures. (i) The requirements of this section apply to the construction of any new major stationary source (as defined in paragraph (b)(1) of this section) or any project at an existing major stationary source in an area designated as attainment or unclassifiable under sections 107(d)(1)(A)(ii) or (iii) of the Ac **Full text:** https://data.regpermit.com/chunk/cfr%2F40%2F52%2F21%23p1%400-8b8e3da1bfd8 ### 3. 40 CFR § 52.21 *Federal (CFR / EPA) · convenience · official* > § 52.21 Prevention of significant deterioration of air quality. . (ii) The requirements of paragraphs (j) through (r) of this section apply to the construction of any new major stationary source or the major modification of any existing major stationary source, except as this section otherwise provid **Full text:** https://data.regpermit.com/chunk/cfr%2F40%2F52%2F21%23p2%400-9aefcd2a2555 ### 4. 40 CFR § 52.21 *Federal (CFR / EPA) · convenience · official* > § 52.21 Prevention of significant deterioration of air quality. s. (iii) No new major stationary source or major modification to which the requirements of paragraphs (j) through (r)(5) of this section apply shall begin actual construction without a permit that states that the major stationary source or major modification will meet those requirements. The Administrator has authority to issue any such per **Full text:** https://data.regpermit.com/chunk/cfr%2F40%2F52%2F21%23p3%400-f6cf735a4186 ### 5. 40 CFR § 52.21 *Federal (CFR / EPA) · convenience · official* > § 52.21 Prevention of significant deterioration of air quality. it. (iv) The requirements of the program will be applied in accordance with the principles set out in paragraphs (a)(2)(iv)(a) through (f) of this sec **Full text:** https://data.regpermit.com/chunk/cfr%2F40%2F52%2F21%23p4%400-f9e66ec38ecb ### 6. 40 CFR § 52.21 *Federal (CFR / EPA) · convenience · official* > § 52.21 Prevention of significant deterioration of air quality. ion. (A) Except as otherwise provided in paragraph (a)(2)(v) of this section, and consistent with the definition of major modification contained in paragraph (b)(2) of this section, a project is a major modification for a regulated NSR pollutant if it causes two types of emissions increases—a significant emissions increase (as defined in paragraph (b)(40) section) and a significant net emissions… **Full text:** https://data.regpermit.com/chunk/cfr%2F40%2F52%2F21%23p5%400-69e533880c63 ### 7. 40 CFR § 52.21 *Federal (CFR / EPA) · convenience · official* > § 52.21 Prevention of significant deterioration of air quality. ease. (B) The procedure for calculating (before beginning actual construction) whether a significant emissions increase (i.e., the first step of the process) will occur depends upon the type of emissions units being modified, according to paragraphs (a)(2)(iv)(c) through (f) of this section. The procedure for calculating (before beginning actual construction) whether a significant net emissions… **Full text:** https://data.regpermit.com/chunk/cfr%2F40%2F52%2F21%23p6%400-d9f432bd3e9b ### 8. 40 CFR § 52.21 *Federal (CFR / EPA) · convenience · official* > § 52.21 Prevention of significant deterioration of air quality. rease. (C) Actual-to-projected-actual applicability test for projects that only involve existing emissions units. A significant emissions increase of a regulated NSR pollutant is projected to occur if the sum of the difference between the projected actual emissions (as defined in paragraph (b)(41) of this section) and the baseline actual emissions (as defined in paragraphs (b)(48)(i) and (ii) of… **Full text:** https://data.regpermit.com/chunk/cfr%2F40%2F52%2F21%23p7%400-7e8adfa05954 ### 9. 40 CFR § 52.21 *Federal (CFR / EPA) · convenience · official* > § 52.21 Prevention of significant deterioration of air quality. ction). (D) Actual-to-potential test for projects that only involve construction of a new emissions unit(s). A significant emissions increase of a regulated NSR pollutant is projected to occur if the sum of the difference between the potential to emit (as defined in paragraph (b)(4) of this section) from each new emissions unit following completion of the project and the baseline actual emissions… **Full text:** https://data.regpermit.com/chunk/cfr%2F40%2F52%2F21%23p8%400-545dde8cc459 ### 10. 40 CFR § 52.21 *Federal (CFR / EPA) · convenience · official* > § 52.21 Prevention of significant deterioration of air quality. ection). (E) **Full text:** https://data.regpermit.com/chunk/cfr%2F40%2F52%2F21%23p9%400-af3c5c38506b ### 11. 40 CFR § 52.21 *Federal (CFR / EPA) · convenience · official* > § 52.21 Prevention of significant deterioration of air quality. Reserved] (F) Hybrid test for projects that involve multiple types of emissions units. A significant emissions increase of a regulated NSR pollutant is projected to occur if the sum of the difference for all emissions units, using the method specified in paragraphs (a)(2)(iv)(c) and (d) of this section as applicable with respect to each emissions unit, equals or exceeds the significant amount for… **Full text:** https://data.regpermit.com/chunk/cfr%2F40%2F52%2F21%23p10%400-5cefdfca19ed ### 12. 40 CFR § 52.21 *Federal (CFR / EPA) · convenience · official* > § 52.21 Prevention of significant deterioration of air quality. section). (G) The “sum of the difference” as used in paragraphs (c), (d) and (f) of this section shall include both increases and decreases in emissions calculated in accordance with those **Full text:** https://data.regpermit.com/chunk/cfr%2F40%2F52%2F21%23p11%400-e34c469cb6fc ### 13. 40 CFR § 52.21 *Federal (CFR / EPA) · convenience · official* > § 52.21 Prevention of significant deterioration of air quality. paragraphs. (v) For any major stationary source for a PAL for a regulated NSR pollutant, the major stationary source shall comply with the requirements under paragraph (aa) of **Full text:** https://data.regpermit.com/chunk/cfr%2F40%2F52%2F21%23p12%400-121df0b2ef6c ### 14. 40 CFR § 52.21 *Federal (CFR / EPA) · convenience · official* > § 52.21 Prevention of significant deterioration of air quality. his section. (b) Definitions. For the purposes of **Full text:** https://data.regpermit.com/chunk/cfr%2F40%2F52%2F21%23p13%400-1dd6ccde7119 ### 15. 40 CFR § 52.21 *Federal (CFR / EPA) · convenience · official* > § 52.21 Prevention of significant deterioration of air quality. this section: (1)(i) Major stationar **Full text:** https://data.regpermit.com/chunk/cfr%2F40%2F52%2F21%23p14%400-0cc2d77d4790 ### 16. 40 CFR § 52.21 *Federal (CFR / EPA) · convenience · official* > § 52.21 Prevention of significant deterioration of air quality. source means: (A) Any of the following stationary sources of air pollutants which emits, or has the potential to emit, 100 tons per year or more of any regulated NSR pollutant: Fossil fuel-fired steam electric plants of more than 250 million British thermal units per hour heat input, coal cleaning plants (with thermal dryers), kraft pulp mills, portland cement plants, primary zinc smelters, iron… **Full text:** https://data.regpermit.com/chunk/cfr%2F40%2F52%2F21%23p15%400-8e72284f76a5 ### 17. 40 CFR § 52.21 *Federal (CFR / EPA) · convenience · official* > § 52.21 Prevention of significant deterioration of air quality. duction plants; (B) Notwithstanding the stationary source size specified in paragraph (b)(1)(i)(a) of this section, any stationary source which emits, or has the potential to emit, 250 tons per year or more of a regulated **Full text:** https://data.regpermit.com/chunk/cfr%2F40%2F52%2F21%23p16%400-38a43f930033 ### 18. 40 CFR § 52.21 *Federal (CFR / EPA) · convenience · official* > § 52.21 Prevention of significant deterioration of air quality. SR pollutant; or (C) Any physical change that would occur at a stationary source not otherwise qualifying under paragraph (b)(1) of this section as a major stationary source, if the change would constitute a major stationary **Full text:** https://data.regpermit.com/chunk/cfr%2F40%2F52%2F21%23p17%400-05f06bc1f057 ### 19. 40 CFR § 52.21 *Federal (CFR / EPA) · convenience · official* > § 52.21 Prevention of significant deterioration of air quality. source by itself. (ii) A major source that is major for volatile organic compounds or NOX shall be consider **Full text:** https://data.regpermit.com/chunk/cfr%2F40%2F52%2F21%23p18%400-c03477c61f10 ### 20. 40 CFR § 52.21 *Federal (CFR / EPA) · convenience · official* > § 52.21 Prevention of significant deterioration of air quality. d major for ozone. (iii) The fugitive emissions of a stationary source shall not be included in determining for any of the purposes of this section whether it is a major stationary source, unless the source belongs to one of the following categories of **Full text:** https://data.regpermit.com/chunk/cfr%2F40%2F52%2F21%23p19%400-f8fcb66d1692 --- **How to use this service** (RegPermit air-quality regulatory corpus): - Read the full text of any result: fetch its **Full text** link above. - Search again: fetch `https://data.regpermit.com/search/` — or just `https://data.regpermit.com/`. - Look up an exact citation: `https://data.regpermit.com/cite/40 CFR 52.21`. - Filter by jurisdiction: add `?j=tx,nm` (federal, tx, nm, ut, co, va, nm-bernco, nm-cabq). - Machine-readable: add `?format=json`. Full API: `https://data.regpermit.com/llms.txt`. Results include both binding rules and agency guidance — for the controlling requirement, prefer a result whose citation is a CFR section or a state administrative code. 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