40 CFR Part 50 - PART 50—NATIONAL PRIMARY AND SECONDARY AMBIENT AIR QUALITY STANDARDS

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  1. § 50.1 Definitions.
  2. § 50.2 Scope.
  3. § 50.3 Reference conditions.
  4. § 50.4 National primary ambient air quality standards for sulfur oxides (sulfur dioxide).
  5. § 50.5 National secondary ambient air quality standard for sulfur oxides (sulfur dioxide).
  6. § 50.6 National primary and secondary ambient air quality standards for PM10.
  7. § 50.7 National primary and secondary ambient air quality standards for PM2.5.
  8. § 50.8 National primary ambient air quality standards for carbon monoxide.
  9. § 50.9 National 1-hour primary and secondary ambient air quality standards for ozone.
  10. § 50.10 National 8-hour primary and secondary ambient air quality standards for ozone.
  11. § 50.11 National primary and secondary ambient air quality standards for oxides of nitrogen (with nitrogen dioxide as the indicator).
  12. § 50.12 National primary and secondary ambient air quality standards for lead.
  13. § 50.13 National primary and secondary ambient air quality standards for PM2.5.
  14. § 50.14 Treatment of air quality monitoring data influenced by exceptional events.
  15. § 50.15 National primary and secondary ambient air quality standards for ozone.
  16. § 50.16 National primary and secondary ambient air quality standards for lead.
  17. § 50.17 National primary ambient air quality standards for sulfur oxides (sulfur dioxide).
  18. § 50.18 National primary ambient air quality standards for PM2.5.
  19. § 50.19 National primary and secondary ambient air quality standards for ozone.
  20. Appendix A–1 to Part 50—Reference Measurement Principle and Calibration Procedure for the Measurement of Sulfur Dioxide in the Atmosphere (Ultraviolet Fluorescence Method)
  21. Appendix A–2 to Part 50—Reference Method for the Determination of Sulfur Dioxide in the Atmosphere (Pararosaniline Method)
  22. Appendix B to Part 50—Reference Method for the Determination of Suspended Particulate Matter in the Atmosphere (High-Volume Method)
  23. Appendix C to Part 50—Measurement Principle and Calibration Procedure for the Measurement of Carbon Monoxide in the Atmosphere (Non-Dispersive Infrared Photometry)
  24. Appendix D to Part 50—Reference Measurement Principle and Calibration Procedure for the Measurement of Ozone in the Atmosphere (Chemiluminescence Method)
  25. Appendix E to Part 50 [Reserved]
  26. Appendix F to Part 50—Measurement Principle and Calibration Procedure for the Measurement of Nitrogen Dioxide in the Atmosphere (Gas Phase Chemiluminescence)
  27. Appendix G to Part 50—Reference Method for the Determination of Lead in Total Suspended Particulate Matter
  28. Appendix H to Part 50—Interpretation of the 1-Hour Primary and Secondary National Ambient Air Quality Standards for Ozone
  29. Appendix I to Part 50—Interpretation of the 8-Hour Primary and Secondary National Ambient Air Quality Standards for Ozone
  30. Appendix J to Part 50—Reference Method for the Determination of Particulate Matter as PM10 in the Atmosphere
  31. Appendix K to Part 50—Interpretation of the National Ambient Air Quality Standards for Particulate Matter
  32. Appendix L to Part 50—Reference Method for the Determination of Fine Particulate Matter as PM2.5 in the Atmosphere
  33. Appendix M to Part 50 [Reserved]
  34. Appendix N to Part 50—Interpretation of the National Ambient Air Quality Standards for PM2.5
  35. Appendix O to Part 50—Reference Method for the Determination of Coarse Particulate Matter as PM10–2.5 in the Atmosphere
  36. Appendix P to Part 50—Interpretation of the Primary and Secondary National Ambient Air Quality Standards for Ozone
  37. Appendix Q to Part 50—Reference Method for the Determination of Lead in Particulate Matter as PM10 Collected From Ambient Air
  38. Appendix R to Part 50—Interpretation of the National Ambient Air Quality Standards for Lead
  39. Appendix S to Part 50—Interpretation of the Primary National Ambient Air Quality Standards for Oxides of Nitrogen (Nitrogen Dioxide)
  40. Appendix T to Part 50—Interpretation of the Primary National Ambient Air Quality Standards for Oxides of Sulfur (Sulfur Dioxide)
  41. Appendix U to Part 50—Interpretation of the Primary and Secondary National Ambient Air Quality Standards for Ozone
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Source:
36 FR 22384, Nov. 25, 1971, unless otherwise noted.

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