Federal (United States) · Regulations

Part 50 — NATIONAL PRIMARY AND SECONDARY AMBIENT AIR QUALITY STANDARDS

40 sections

40 C.F.R. § 50.1Definitions.
40 C.F.R. § 50.2Scope.
40 C.F.R. § 50.4National primary ambient air quality standards for sulfur oxides (sulfur dioxide).
40 C.F.R. § 50.5National secondary ambient air quality standard for sulfur oxides (sulfur dioxide).
40 C.F.R. § 50.6National primary and secondary ambient air quality standards for PM 10 .
40 C.F.R. § 50.7National primary and secondary ambient air quality standards for PM 2.5 .
40 C.F.R. § 50.8National primary ambient air quality standards for carbon monoxide.
40 C.F.R. § 50.9National 1-hour primary and secondary ambient air quality standards for ozone.
40 C.F.R. § 50.10National 8-hour primary and secondary ambient air quality standards for ozone.
40 C.F.R. § 50.11National primary and secondary ambient air quality standards for oxides of nitrogen (with nitrogen dioxide as the indicator).
40 C.F.R. § 50.12National primary and secondary ambient air quality standards for lead.
40 C.F.R. § 50.13National primary and secondary ambient air quality standards for PM 2.5 .
40 C.F.R. § 50.15National primary and secondary ambient air quality standards for ozone.
40 C.F.R. § 50.16National primary and secondary ambient air quality standards for lead.
40 C.F.R. § 50.17National primary ambient air quality standards for sulfur oxides (sulfur dioxide).
40 C.F.R. § 50.18National primary ambient air quality standards for PM 2.5 .
40 C.F.R. § 50.19National primary and secondary ambient air quality standards for ozone.
40 C.F.R. § 50.21National secondary ambient air quality standards for sulfur oxides (sulfur dioxide).
40 C.F.R. Appendix A-1 to Part 50Reference Measurement Principle and Calibration Procedure for the Measurement of Sulfur Dioxide in the Atmosphere (Ultraviolet Fluorescence Method)
40 C.F.R. Appendix A-2 to Part 50Reference Method for the Determination of Sulfur Dioxide in the Atmosphere (Pararosaniline Method)
40 C.F.R. Appendix B to Part 50Reference Method for the Determination of Suspended Particulate Matter in the Atmosphere (High-Volume Method)
40 C.F.R. Appendix C to Part 50Measurement Principle and Calibration Procedure for the Measurement of Carbon Monoxide in the Atmosphere (Non-Dispersive Infrared Photometry)
40 C.F.R. Appendix D to Part 50Reference Measurement Principle and Calibration Procedure for the Measurement of Ozone in the Atmosphere (Chemiluminescence Method)
40 C.F.R. Appendix E to Part 50[Reserved]Reserved
40 C.F.R. Appendix F to Part 50Measurement Principle and Calibration Procedure for the Measurement of Nitrogen Dioxide in the Atmosphere (Gas Phase Chemiluminescence)
40 C.F.R. Appendix G to Part 50Reference Method for the Determination of Lead in Total Suspended Particulate Matter
40 C.F.R. Appendix H to Part 50Interpretation of the 1-Hour Primary and Secondary National Ambient Air Quality Standards for Ozone
40 C.F.R. Appendix I to Part 50Interpretation of the 8-Hour Primary and Secondary National Ambient Air Quality Standards for Ozone
40 C.F.R. Appendix J to Part 50Reference Method for the Determination of Particulate Matter as PM 10 in the Atmosphere
40 C.F.R. Appendix K to Part 50Interpretation of the National Ambient Air Quality Standards for Particulate Matter
40 C.F.R. Appendix L to Part 50Reference Method for the Determination of Fine Particulate Matter as PM 2.5 in the Atmosphere
40 C.F.R. Appendix M to Part 50[Reserved]Reserved
40 C.F.R. Appendix N to Part 50Interpretation of the National Ambient Air Quality Standards for PM 2.5
40 C.F.R. Appendix O to Part 50Reference Method for the Determination of Coarse Particulate Matter as PM 10-2.5 in the Atmosphere
40 C.F.R. Appendix P to Part 50Interpretation of the Primary and Secondary National Ambient Air Quality Standards for Ozone
40 C.F.R. Appendix Q to Part 50Reference Method for the Determination of Lead in Particulate Matter as PM 10 Collected From Ambient Air
40 C.F.R. Appendix R to Part 50Interpretation of the National Ambient Air Quality Standards for Lead
40 C.F.R. Appendix S to Part 50Interpretation of the Primary National Ambient Air Quality Standards for Oxides of Nitrogen (Nitrogen Dioxide)
40 C.F.R. Appendix T to Part 50Interpretation of the Primary and Secondary National Ambient Air Quality Standards for Oxides of Sulfur (Sulfur Dioxide)
40 C.F.R. Appendix U to Part 50Interpretation of the Primary and Secondary National Ambient Air Quality Standards for Ozone