Part 50. PART 50—NATIONAL PRIMARY AND SECONDARY AMBIENT AIR QUALITY STANDARDS

• § 50.1 - Definitions.
• § 50.2 - Scope.
• § 50.3 - Reference conditions.
• § 50.4 - National primary ambient air quality standards for sulfur oxides (sulfur dioxide).
• § 50.5 - National secondary ambient air quality standard for sulfur oxides (sulfur dioxide).
• § 50.6 - National primary and secondary ambient air quality standards for PM10.
• § 50.7 - National primary and secondary ambient air quality standards for PM2.5.
• § 50.8 - National primary ambient air quality standards for carbon monoxide.
• § 50.9 - National 1-hour primary and secondary ambient air quality standards for ozone.
• § 50.10 - National 8-hour primary and secondary ambient air quality standards for ozone.
• § 50.11 - National primary and secondary ambient air quality standards for oxides of nitrogen (with nitrogen dioxide as the indicator).
• § 50.12 - National primary and secondary ambient air quality standards for lead.
• § 50.13 - National primary and secondary ambient air quality standards for PM2.5.
• § 50.14 - Treatment of air quality monitoring data influenced by exceptional events.
• § 50.15 - National primary and secondary ambient air quality standards for ozone.
• § 50.16 - National primary and secondary ambient air quality standards for lead.
• § 50.17 - National primary ambient air quality standards for sulfur oxides (sulfur dioxide).
• § 50.18 - National primary ambient air quality standards for PM2.5.
• § 50.19 - National primary and secondary ambient air quality standards for ozone.
• § 50.20 - National primary ambient air quality standards for PM2.5.

• APPENDIX

  • Appendix A-1 to Part 50—Reference Measurement Principle and Calibration Procedure for the Measurement of Sulfur Dioxide in the Atmosphere (Ultraviolet Fluorescence Method)
  • Appendix A-2 to Part 50—Reference Method for the Determination of Sulfur Dioxide in the Atmosphere (Pararosaniline Method)
  • Appendix B to Part 50—Reference Method for the Determination of Suspended Particulate Matter in the Atmosphere (High-Volume Method)
  • Appendix C to Part 50—Measurement Principle and Calibration Procedure for the Measurement of Carbon Monoxide in the Atmosphere (Non-Dispersive Infrared Photometry)
  • Appendix D to Part 50—Reference Measurement Principle and Calibration Procedure for the Measurement of Ozone in the Atmosphere (Chemiluminescence Method)
  • Appendix E to Part 50 [Reserved]
  • Appendix F to Part 50—Measurement Principle and Calibration Procedure for the Measurement of Nitrogen Dioxide in the Atmosphere (Gas Phase Chemiluminescence)
  • Appendix G to Part 50—Reference Method for the Determination of Lead in Total Suspended Particulate Matter
  • Appendix H to Part 50—Interpretation of the 1-Hour Primary and Secondary National Ambient Air Quality Standards for Ozone
  • Appendix I to Part 50—Interpretation of the 8-Hour Primary and Secondary National Ambient Air Quality Standards for Ozone
  • Appendix J to Part 50—Reference Method for the Determination of Particulate Matter as PM10 in the Atmosphere
  • Appendix K to Part 50—Interpretation of the National Ambient Air Quality Standards for Particulate Matter
  • Appendix L to Part 50—Reference Method for the Determination of Fine Particulate Matter as PM2.5 in the Atmosphere
  • Appendix M to Part 50 [Reserved]
  • Appendix N to Part 50—Interpretation of the National Ambient Air Quality Standards for PM2.5
  • Appendix O to Part 50—Reference Method for the Determination of Coarse Particulate Matter as PM10-2.5 in the Atmosphere
  • Appendix P to Part 50—Interpretation of the Primary and Secondary National Ambient Air Quality Standards for Ozone
  • Appendix Q to Part 50—Reference Method for the Determination of Lead in Particulate Matter as PM10 Collected From Ambient Air
  • Appendix R to Part 50—Interpretation of the National Ambient Air Quality Standards for Lead
  • Appendix S to Part 50—Interpretation of the Primary National Ambient Air Quality Standards for Oxides of Nitrogen (Nitrogen Dioxide)
  • Appendix T to Part 50—Interpretation of the Primary National Ambient Air Quality Standards for Oxides of Sulfur (Sulfur Dioxide)
  • Appendix U to Part 50—Interpretation of the Primary and Secondary National Ambient Air Quality Standards for Ozone