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Regulations last checked for updates: Jan 12, 2026
Title 40 - Protection of Environment last revised: Dec 31, 2026
All Titles
Title 40
Chapter I
Part 58 - PART 58—AMBIENT AIR QUALITY SURVEILLANCE
Subpart A [§ 58.1 - § 58.3] - Subpart A—General Provisions
Subpart B [§ 58.10 - § 58.16] - Subpart B—Monitoring Network
Subpart C [§ 58.20 - § 58.20] - Subpart C—Special Purpose Monitors
Subpart D [§ 58.30 - § 58.30] - Subpart D—Comparability of Ambient Data to the NAAQS
Subpart E - Subpart E [Reserved]
Subpart F [§ 58.50 - § 58.50] - Subpart F—Air Quality Index Reporting
Subpart G [§ 58.60 - § 58.61] - Subpart G—Federal Monitoring
Subpart 0 -
Appendix Appendix A - Appendix A to Part 58—Quality Assurance Requirements for Monitors used in Evaluations of National Ambient Air Quality Standards
Appendix Appendix B - Appendix B to Part 58—Quality Assurance Requirements for Prevention of Significant Deterioration (PSD) Air Monitoring
Appendix Appendix C - Appendix C to Part 58—Ambient Air Quality Monitoring Methodology
Appendix Appendix D - Appendix D to Part 58—Network Design Criteria for Ambient Air Quality Monitoring
Appendix Appendix E - Appendix E to Part 58—Probe and Monitoring Path Siting Criteria for Ambient Air Quality Monitoring
Appendix Appendix F - Appendix F to Part 58 [Reserved]
Appendix Appendix G - Appendix G to Part 58—Uniform Air Quality Index (AQI) and Daily Reporting
authority:
42 U.S.C. 7403
,
7405
,
7410
,
7414
,
7601
,
7611
,
7614
,
and
source:
44 FR 27571, May 10, 1979; 59 FR 41628, Aug. 12, 1994, unless otherwise noted.
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