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Subchapter C—Air Programs

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Subchapter C—Air Programs SUBCHAPTER C—AIR PROGRAMS PART 50—NATIONAL PRIMARY AND IN THE ATMOSPHERE (NON-DISPERSIVE IN- FRARED PHOTOMETRY) SECONDARY AMBIENT AIR APPENDIX D TO PART 50—REFERENCE MEAS- QUALITY STANDARDS UREMENT PRINCIPLE AND CALIBRATION PROCEDURE FOR THE MEASUREMENT OF Sec. OZONE IN THE ATMOSPHERE 50.1 Definitions. (CHEMILUMINESCENCE METHOD) 50.2 Scope. APPENDIX E TO PART 50 [RESERVED] 50.3 Reference conditions. APPENDIX F TO PART 50—MEASUREMENT PRIN- 50.4 National primary ambient air quality CIPLE AND CALIBRATION PROCEDURE FOR standards for sulfur oxides (sulfur diox- THE MEASUREMENT OF NITROGEN DIOXIDE ide). IN THE ATMOSPHERE (GAS PHASE 50.5 National secondary ambient air quality CHEMILUMINESCENCE) standard for sulfur oxides (sulfur diox- APPENDIX G TO PART 50—REFERENCE METHOD ide). FOR THE DETERMINATION OF LEAD IN 50.6 National primary and secondary ambi- TOTAL SUSPENDED PARTICULATE MATTER ent air quality standards for PM10. APPENDIX H TO PART 50—INTERPRETATION OF 50.7 National primary and secondary ambi- THE 1-HOUR PRIMARY AND SECONDARY NA- ent air quality standards for PM2.5. TIONAL AMBIENT AIR QUALITY STANDARDS 50.8 National primary ambient air quality FOR OZONE standards for carbon monoxide. APPENDIX I TO PART 50—INTERPRETATION OF 50.9 National 1-hour primary and secondary THE 8-HOUR PRIMARY AND SECONDARY NA- ambient air quality standards for ozone. TIONAL AMBIENT AIR QUALITY STANDARDS 50.10 National 8-hour primary and sec- FOR OZONE ondary ambient air quality standards for APPENDIX J TO PART 50—REFERENCE METHOD ozone. FOR THE DETERMINATION OF PARTICULATE 50.11 National primary and secondary ambi- MATTER AS PM10 IN THE ATMOSPHERE ent air quality standards for oxides of ni- APPENDIX K TO PART 50—INTERPRETATION OF trogen (with nitrogen dioxide as the indi- THE NATIONAL AMBIENT AIR QUALITY cator). STANDARDS FOR PARTICULATE MATTER 50.12 National primary and secondary ambi- APPENDIX L TO PART 50—REFERENCE METHOD ent air quality standards for lead. FOR THE DETERMINATION OF FINE PARTIC- 50.13 National primary and secondary ambi- ULATE MATTER AS PM2.5 IN THE ATMOS- ent air quality standards for PM2.5. PHERE 50.14 Treatment of air quality monitoring APPENDIX M TO PART 50 [RESERVED] data influenced by exceptional events. APPENDIX N TO PART 50—INTERPRETATION OF 50.15 National primary and secondary ambi- THE NATIONAL AMBIENT AIR QUALITY ent air quality standards for ozone. STANDARDS FOR PM2.5 50.16 National primary and secondary ambi- APPENDIX O TO PART 50—REFERENCE METHOD ent air quality standards for lead. FOR THE DETERMINATION OF COARSE PAR- 50.17 National primary ambient air quality TICULATE MATTER AS PM10–2.5 IN THE AT- standards for sulfur oxides (sulfur diox- MOSPHERE ide). APPENDIX P TO PART 50—INTERPRETATION OF 50.18 National primary ambient air quality THE PRIMARY AND SECONDARY NATIONAL standards for PM2.5. AMBIENT AIR QUALITY STANDARDS FOR 50.19 National primary and secondary ambi- OZONE ent air quality standards for ozone. APPENDIX Q TO PART 50—REFERENCE METHOD APPENDIX A–1 TO PART 50—REFERENCE MEAS- FOR THE DETERMINATION OF LEAD IN PAR- UREMENT PRINCIPLE AND CALIBRATION TICULATE MATTER AS PM10 COLLECTED PROCEDURE FOR THE MEASUREMENT OF FROM AMBIENT AIR SULFUR DIOXIDE IN THE ATMOSPHERE (UL- APPENDIX R TO PART 50—INTERPRETATION OF TRAVIOLET FLUORESCENCE METHOD) THE NATIONAL AMBIENT AIR QUALITY APPENDIX A–2 TO PART 50—REFERENCE METH- STANDARDS FOR LEAD OD FOR THE DETERMINATION OF SULFUR APPENDIX S TO PART 50—INTERPRETATION OF DIOXIDE IN THE ATMOSPHERE THE PRIMARY NATIONAL AMBIENT AIR (PARAROSANILINE METHOD) QUALITY STANDARDS FOR OXIDES OF NI- APPENDIX B TO PART 50—REFERENCE METHOD TROGEN (NITROGEN DIOXIDE) FOR THE DETERMINATION OF SUSPENDED APPENDIX T TO PART 50—INTERPRETATION OF PARTICULATE MATTER IN THE ATMOS- THE PRIMARY NATIONAL AMBIENT AIR PHERE (HIGH-VOLUME METHOD) QUALITY STANDARDS FOR OXIDES OF SUL- APPENDIX C TO PART 50—MEASUREMENT PRIN- FUR (SULFUR DIOXIDE) CIPLE AND CALIBRATION PROCEDURE FOR APPENDIX U TO PART 50—INTERPRETATION OF THE MEASUREMENT OF CARBON MONOXIDE THE PRIMARY AND SECONDARY NATIONAL 5 VerDate Sep<11>2014 12:41 Oct 01, 2019 Jkt 247152 PO 00000 Frm 00015 Fmt 8010 Sfmt 8010 Y:\SGML\247152.XXX 247152 jspears on DSK3GMQ082PROD with CFR § 50.1 40 CFR Ch. I (7–1–19 Edition) AMBIENT AIR QUALITY STANDARDS FOR lable or preventable, is an event(s) OZONE caused by human activity that is un- AUTHORITY: 42 U.S.C. 7401, et seq. likely to recur at a particular location or a natural event(s), and is determined SOURCE: 36 FR 22384, Nov. 25, 1971, unless otherwise noted. by the Administrator in accordance with 40 CFR 50.14 to be an exceptional § 50.1 Definitions. event. It does not include air pollution (a) As used in this part, all terms not relating to source noncompliance. defined herein shall have the meaning Stagnation of air masses and meteoro- given them by the Act. logical inversions do not directly cause (b) Act means the Clean Air Act, as pollutant emissions and are not excep- amended (42 U.S.C. 1857–18571, as tional events. Meteorological events amended by Pub. L. 91–604). involving high temperatures or lack of (c) Agency means the Environmental precipitation (i.e., severe, extreme or Protection Agency. exceptional drought) also do not di- (d) Administrator means the Adminis- rectly cause pollutant emissions and trator of the Environmental Protection are not considered exceptional events. Agency. However, conditions involving high (e) Ambient air means that portion of temperatures or lack of precipitation the atmosphere, external to buildings, may promote occurrences of particular to which the general public has access. types of exceptional events, such as (f) Reference method means a method wildfires or high wind events, which do of sampling and analyzing the ambient directly cause emissions. air for an air pollutant that is specified (k) Natural event means an event and as a reference method in an appendix its resulting emissions, which may to this part, or a method that has been recur at the same location, in which designated as a reference method in ac- human activity plays little or no direct cordance with part 53 of this chapter; it causal role. For purposes of the defini- does not include a method for which a tion of a natural event, anthropogenic reference method designation has been sources that are reasonably controlled cancelled in accordance with § 53.11 or shall be considered to not play a direct § 53.16 of this chapter. role in causing emissions. (g) Equivalent method means a method (l) Exceedance with respect to a na- of sampling and analyzing the ambient tional ambient air quality standard air for an air pollutant that has been means one occurrence of a measured or designated as an equivalent method in modeled concentration that exceeds accordance with part 53 of this chapter; the specified concentration level of it does not include a method for which such standard for the averaging period an equivalent method designation has specified by the standard. been cancelled in accordance with (m) Prescribed fire is any fire inten- § 53.11 or § 53.16 of this chapter. tionally ignited by management ac- (h) Traceable means that a local tions in accordance with applicable standard has been compared and cer- laws, policies, and regulations to meet tified either directly or via not more specific land or resource management than one intermediate standard, to a objectives. primary standard such as a National (n) Wildfire is any fire started by an Bureau of Standards Standard Ref- unplanned ignition caused by light- erence Material (NBS SRM), or a ning; volcanoes; other acts of nature; USEPA/NBS-approved Certified Ref- unauthorized activity; or accidental, erence Material (CRM). human-caused actions, or a prescribed (i) Indian country is as defined in 18 fire that has developed into a wildfire. U.S.C. 1151. A wildfire that predominantly occurs (j) Exceptional event means an on wildland is a natural event. event(s) and its resulting emissions (o) Wildland means an area in which that affect air quality in such a way human activity and development are that there exists a clear causal rela- essentially non-existent, except for tionship between the specific event(s) roads, railroads, power lines, and simi- and the monitored exceedance(s) or lar transportation facilities. Struc- violation(s), is not reasonably control- tures, if any, are widely scattered. 6 VerDate Sep<11>2014 12:41 Oct 01, 2019 Jkt 247152 PO 00000 Frm 00016 Fmt 8010 Sfmt 8010 Y:\SGML\247152.XXX 247152 jspears on DSK3GMQ082PROD with CFR Environmental Protection Agency § 50.4 (p) High wind dust event is an event any portion thereof which are more that includes the high-speed wind and stringent than the national standards. the dust that the wind entrains and [36 FR 22384, Nov. 25, 1971, as amended at 63 transports to a monitoring site. FR 7274, Feb. 12, 1998] (q) High wind threshold is the min- imum wind speed capable of causing § 50.3 Reference conditions. particulate matter emissions from nat- All measurements of air quality that ural undisturbed lands in the area af- are expressed as mass per unit volume fected by a high wind dust event. (e.g., micrograms per cubic meter) (r) Federal land manager means, con- other than for particulate matter sistent with the definition in 40 CFR (PM2.5) standards contained in §§ 50.7, 51.301, the Secretary of the department 50.13, and 50.18, and lead standards con- with authority over the Federal Class I tained in § 50.16 shall be corrected to a area (or the Secretary’s designee) or, reference temperature of 25 (deg) C and with respect to Roosevelt-Campobello a reference pressure of 760 millimeters International Park, the Chairman of of mercury (1,013.2 millibars).
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