Regulations last checked for updates: Jan 12, 2026

Title 40 - Protection of Environment last revised: Dec 31, 2026
All TitlesTitle 40Chapter IPart 50Appendix Appendix R - Appendix R to Part 50—Interpretation of the National Ambient Air Quality Standards for Lead
Collapse to view onlyAppendix Appendix R - Appendix R to Part 50—Interpretation of the National Ambient Air Quality Standards for Lead
Table of Contents

authority: 42 U.S.C. 7401,
source: 36 FR 22384, Nov. 25, 1971, unless otherwise noted.
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