Part 50—National Primary and Secondary Ambient Air Quality Standards

1. CFR
2. ›
3. Title 40
4. ›
5. Chapter I
6. ›
7. Part 50

Contents

• 50.1
  § 50.1 Definitions.
• 50.2
  § 50.2 Scope.
• 50.3
  § 50.3 Reference conditions.
• 50.4
  § 50.4 National primary ambient air quality standards for sulfur oxides (sulfur dioxide).
• 50.5
  § 50.5 National secondary ambient air quality standard for sulfur oxides (sulfur dioxide).
• 50.6
  § 50.6 National primary and secondary ambient air quality standards for PM₁₀.
• 50.7
  § 50.7 National primary and secondary ambient air quality standards for PM_2.5.
• 50.8
  § 50.8 National primary ambient air quality standards for carbon monoxide.
• 50.9
  § 50.9 National 1-hour primary and secondary ambient air quality standards for ozone.
• 50.10
  § 50.10 National 8-hour primary and secondary ambient air quality standards for ozone.
• 50.11
  § 50.11 National primary and secondary ambient air quality standards for oxides of nitrogen (with nitrogen dioxide as the indicator).
• 50.12
  § 50.12 National primary and secondary ambient air quality standards for lead.
• 50.13
  § 50.13 National primary and secondary ambient air quality standards for PM_2.5.
• 50.14
  § 50.14 Treatment of air quality monitoring data influenced by exceptional events.
• 50.15
  § 50.15 National primary and secondary ambient air quality standards for ozone.
• 50.16
  § 50.16 National primary and secondary ambient air quality standards for lead.
• 50.17
  § 50.17 National primary ambient air quality standards for sulfur oxides (sulfur dioxide).
• 50.18
  § 50.18 National primary ambient air quality standards for PM_2.5.
• 50.19
  § 50.19 National primary and secondary ambient air quality standards for ozone.
• 50.20
  § 50.20 National primary ambient air quality standards for PM_2.5.
• 50.21
  § 50.21 National secondary ambient air quality standards for sulfur oxides (sulfur dioxide).
• Appendix A-1 to Part 50
  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
  Appendix A-2 to Part 50—Reference Method for the Determination of Sulfur Dioxide in the Atmosphere (Pararosaniline Method)
• Appendix B to Part 50
  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
  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
  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
  Appendix E to Part 50 [Reserved]
• Appendix F to Part 50
  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
  Appendix G to Part 50—Reference Method for the Determination of Lead in Total Suspended Particulate Matter
• Appendix H to Part 50
  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
  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
  Appendix J to Part 50—Reference Method for the Determination of Particulate Matter as PM₁₀ in the Atmosphere
• Appendix K to Part 50
  Appendix K to Part 50—Interpretation of the National Ambient Air Quality Standards for Particulate Matter
• Appendix L to Part 50
  Appendix L to Part 50—Reference Method for the Determination of Fine Particulate Matter as PM_2.5 in the Atmosphere
• Appendix M to Part 50
  Appendix M to Part 50 [Reserved]
• Appendix N to Part 50
  Appendix N to Part 50—Interpretation of the National Ambient Air Quality Standards for PM_2.5
• Appendix O to Part 50
  Appendix O to Part 50—Reference Method for the Determination of Coarse Particulate Matter as PM_10-2.5 in the Atmosphere
• Appendix P to Part 50
  Appendix P to Part 50—Interpretation of the Primary and Secondary National Ambient Air Quality Standards for Ozone
• Appendix Q to Part 50
  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
  Appendix R to Part 50—Interpretation of the National Ambient Air Quality Standards for Lead
• Appendix S to Part 50
  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
  Appendix T to Part 50—Interpretation of the Primary and Secondary National Ambient Air Quality Standards for Oxides of Sulfur (Sulfur Dioxide)
• Appendix U to Part 50
  Appendix U to Part 50—Interpretation of the Primary and Secondary National Ambient Air Quality Standards for Ozone