Title 40

PART 50

Part 50 - National Primary And Secondary Ambient Air Quality Standards

PART 50 - NATIONAL PRIMARY AND SECONDARY AMBIENT AIR QUALITY STANDARDS Authority:42 U.S.C. 7401, et seq. Source:36 FR 22384, Nov. 25, 1971, unless otherwise noted.

• Authority: 42 U.S.C. 7401, et seq.
• Source: 36 FR 22384, Nov. 25, 1971, unless otherwise noted.

40:2.0.1.1.1.0.1.1	SECTION 50.1	50.1 Definitions.
40:2.0.1.1.1.0.1.2	SECTION 50.2	50.2 Scope.
40:2.0.1.1.1.0.1.3	SECTION 50.3	50.3 Reference conditions.
40:2.0.1.1.1.0.1.4	SECTION 50.4	50.4 National primary ambient air quality standards for sulfur oxides (sulfur dioxide).
40:2.0.1.1.1.0.1.5	SECTION 50.5	50.5 National secondary ambient air quality standard for sulfur oxides (sulfur dioxide).
40:2.0.1.1.1.0.1.6	SECTION 50.6	50.6 National primary and secondary ambient air quality standards for PM10.
40:2.0.1.1.1.0.1.7	SECTION 50.7	50.7 National primary and secondary ambient air quality standards for PM2.5.
40:2.0.1.1.1.0.1.8	SECTION 50.8	50.8 National primary ambient air quality standards for carbon monoxide.
40:2.0.1.1.1.0.1.9	SECTION 50.9	50.9 National 1-hour primary and secondary ambient air quality standards for ozone.
40:2.0.1.1.1.0.1.10	SECTION 50.10	50.10 National 8-hour primary and secondary ambient air quality standards for ozone.
40:2.0.1.1.1.0.1.11	SECTION 50.11	50.11 National primary and secondary ambient air quality standards for oxides of nitrogen (with nitrogen dioxide as the indicator).
40:2.0.1.1.1.0.1.12	SECTION 50.12	50.12 National primary and secondary ambient air quality standards for lead.
40:2.0.1.1.1.0.1.13	SECTION 50.13	50.13 National primary and secondary ambient air quality standards for PM2.5.
40:2.0.1.1.1.0.1.14	SECTION 50.14	50.14 Treatment of air quality monitoring data influenced by exceptional events.
40:2.0.1.1.1.0.1.15	SECTION 50.15	50.15 National primary and secondary ambient air quality standards for ozone.
40:2.0.1.1.1.0.1.16	SECTION 50.16	50.16 National primary and secondary ambient air quality standards for lead.
40:2.0.1.1.1.0.1.17	SECTION 50.17	50.17 National primary ambient air quality standards for sulfur oxides (sulfur dioxide).
40:2.0.1.1.1.0.1.18	SECTION 50.18	50.18 National primary ambient air quality standards for PM2.5.
40:2.0.1.1.1.0.1.19	SECTION 50.19	50.19 National primary and secondary ambient air quality standards for ozone.
40:2.0.1.1.1.0.1.20.1	APPENDIX Appendix A	Appendix A-1 to Part 50 - Reference Measurement Principle and Calibration Procedure for the Measurement of Sulfur Dioxide in the Atmosphere (Ultraviolet Fluorescence Method)
40:2.0.1.1.1.0.1.20.2	APPENDIX Appendix A	Appendix A-2 to Part 50 - Reference Method for the Determination of Sulfur Dioxide in the Atmosphere (Pararosaniline Method)
40:2.0.1.1.1.0.1.20.3	APPENDIX Appendix B	Appendix B to Part 50 - Reference Method for the Determination of Suspended Particulate Matter in the Atmosphere (High-Volume Method)
40:2.0.1.1.1.0.1.20.4	APPENDIX Appendix C	Appendix C to Part 50 - Measurement Principle and Calibration Procedure for the Measurement of Carbon Monoxide in the Atmosphere (Non-Dispersive Infrared Photometry)
40:2.0.1.1.1.0.1.20.5	APPENDIX Appendix D	Appendix D to Part 50 - Reference Measurement Principle and Calibration Procedure for the Measurement of Ozone in the Atmosphere (Chemiluminescence Method)
40:2.0.1.1.1.0.1.20.6	APPENDIX Appendix E	Appendix E to Part 50 [Reserved]
40:2.0.1.1.1.0.1.20.7	APPENDIX Appendix F	Appendix F to Part 50 - Measurement Principle and Calibration Procedure for the Measurement of Nitrogen Dioxide in the Atmosphere (Gas Phase Chemiluminescence)
40:2.0.1.1.1.0.1.20.8	APPENDIX Appendix G	Appendix G to Part 50 - Reference Method for the Determination of Lead in Total Suspended Particulate Matter
40:2.0.1.1.1.0.1.20.9	APPENDIX Appendix H	Appendix H to Part 50 - Interpretation of the 1-Hour Primary and Secondary National Ambient Air Quality Standards for Ozone
40:2.0.1.1.1.0.1.20.10	APPENDIX Appendix I	Appendix I to Part 50 - Interpretation of the 8-Hour Primary and Secondary National Ambient Air Quality Standards for Ozone
40:2.0.1.1.1.0.1.20.11	APPENDIX Appendix J	Appendix J to Part 50 - Reference Method for the Determination of Particulate Matter as PM10 in the Atmosphere
40:2.0.1.1.1.0.1.20.12	APPENDIX Appendix K	Appendix K to Part 50 - Interpretation of the National Ambient Air Quality Standards for Particulate Matter
40:2.0.1.1.1.0.1.20.13	APPENDIX Appendix L	Appendix L to Part 50 - Reference Method for the Determination of Fine Particulate Matter as PM2.5 in the Atmosphere
40:2.0.1.1.1.0.1.20.14	APPENDIX Appendix M	Appendix M to Part 50 [Reserved]
40:2.0.1.1.1.0.1.20.15	APPENDIX Appendix N	Appendix N to Part 50 - Interpretation of the National Ambient Air Quality Standards for PM2.5
40:2.0.1.1.1.0.1.20.16	APPENDIX Appendix O	Appendix O to Part 50 - Reference Method for the Determination of Coarse Particulate Matter as PM10-2.5 in the Atmosphere
40:2.0.1.1.1.0.1.20.17	APPENDIX Appendix P	Appendix P to Part 50 - Interpretation of the Primary and Secondary National Ambient Air Quality Standards for Ozone
40:2.0.1.1.1.0.1.20.18	APPENDIX Appendix Q	Appendix Q to Part 50 - Reference Method for the Determination of Lead in Particulate Matter as PM10 Collected From Ambient Air
40:2.0.1.1.1.0.1.20.19	APPENDIX Appendix R	Appendix R to Part 50 - Interpretation of the National Ambient Air Quality Standards for Lead
40:2.0.1.1.1.0.1.20.20	APPENDIX Appendix S	Appendix S to Part 50 - Interpretation of the Primary National Ambient Air Quality Standards for Oxides of Nitrogen (Nitrogen Dioxide)
40:2.0.1.1.1.0.1.20.21	APPENDIX Appendix T	Appendix T to Part 50 - Interpretation of the Primary National Ambient Air Quality Standards for Oxides of Sulfur (Sulfur Dioxide)
40:2.0.1.1.1.0.1.20.22	APPENDIX Appendix U	Appendix U to Part 50 - Interpretation of the Primary and Secondary National Ambient Air Quality Standards for Ozone

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