CFR›Title 40›Chapter I›Part 51›Subpart Q ContainsSubject groups Air Quality Data Reporting–Source Emissions and State Action ReportingCorpusDaily eCFRDisplayed edition2026-05-18Last updated2026-05-18 Subpart Q—Reports Subject Groups Air Quality Data Reporting Air Quality Data Reporting Section 51.320 Source Emissions and State Action Reporting Source Emissions and State Action Reporting Sections 51.321–51.328 AuthoritySecs. 110, 301(a), 313, 319, Clean Air Act (42 U.S.C. 7410, 7601(a), 7613, 7619).Source44 FR 27569, May 10, 1979, unless otherwise noted. Previous P Subpart P—Protection of Visibility Next R Subpart R—Extensions