40 CFR 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. § 50.20 National primary ambient air quality standards for PM2.5.
  21. § 50.21 National secondary ambient air quality standards for sulfur oxides (sulfur dioxide).
  22. Appendix A-1 to Part 50—Reference Measurement Principle and Calibration Procedure for the Measurement of Sulfur Dioxide in the Atmosphere (Ultraviolet Fluorescence Method)
  23. Appendix A-2 to Part 50—Reference Method for the Determination of Sulfur Dioxide in the Atmosphere (Pararosaniline Method)
  24. Appendix B to Part 50—Reference Method for the Determination of Suspended Particulate Matter in the Atmosphere (High-Volume Method)
  25. Appendix C to Part 50—Measurement Principle and Calibration Procedure for the Measurement of Carbon Monoxide in the Atmosphere (Non-Dispersive Infrared Photometry)
  26. Appendix D to Part 50—Reference Measurement Principle and Calibration Procedure for the Measurement of Ozone in the Atmosphere (Chemiluminescence Method)
  27. Appendix E to Part 50 [Reserved]
  28. Appendix F to Part 50—Measurement Principle and Calibration Procedure for the Measurement of Nitrogen Dioxide in the Atmosphere (Gas Phase Chemiluminescence)
  29. Appendix G to Part 50—Reference Method for the Determination of Lead in Total Suspended Particulate Matter
  30. Appendix H to Part 50—Interpretation of the 1-Hour Primary and Secondary National Ambient Air Quality Standards for Ozone
  31. Appendix I to Part 50—Interpretation of the 8-Hour Primary and Secondary National Ambient Air Quality Standards for Ozone
  32. Appendix J to Part 50—Reference Method for the Determination of Particulate Matter as PM10 in the Atmosphere
  33. Appendix K to Part 50—Interpretation of the National Ambient Air Quality Standards for Particulate Matter
  34. Appendix L to Part 50—Reference Method for the Determination of Fine Particulate Matter as PM2.5 in the Atmosphere
  35. Appendix M to Part 50 [Reserved]
  36. Appendix N to Part 50—Interpretation of the National Ambient Air Quality Standards for PM2.5
  37. Appendix O to Part 50—Reference Method for the Determination of Coarse Particulate Matter as PM10-2.5 in the Atmosphere
  38. Appendix P to Part 50—Interpretation of the Primary and Secondary National Ambient Air Quality Standards for Ozone
  39. Appendix Q to Part 50—Reference Method for the Determination of Lead in Particulate Matter as PM10 Collected From Ambient Air
  40. Appendix R to Part 50—Interpretation of the National Ambient Air Quality Standards for Lead
  41. Appendix S to Part 50—Interpretation of the Primary National Ambient Air Quality Standards for Oxides of Nitrogen (Nitrogen Dioxide)
  42. Appendix T to Part 50—Interpretation of the Primary and Secondary National Ambient Air Quality Standards for Oxides of Sulfur (Sulfur Dioxide)
  43. Appendix U to Part 50—Interpretation of the Primary and Secondary National Ambient Air Quality Standards for Ozone
Authority:
42 U.S.C. 7401, et seq.
Source:
36 FR 22384, Nov. 25, 1971, unless otherwise noted.