CFR›Title 40›Chapter I›Part 60›Subpart PP ContainsSections 60.420–60.424CorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 Subpart PP—Standards of Performance for Ammonium Sulfate Manufacture Sections 60.420 § 60.420 Applicability and designation of affected facility. 60.421 § 60.421 Definitions. 60.422 § 60.422 Standards for particulate matter. 60.423 § 60.423 Monitoring of operations. 60.424 § 60.424 Test methods and procedures. Source45 FR 74850, Nov. 12, 1980, unless otherwise noted. Previous P Subpart P—Standards of Performance for Primary Copper Smelters Next PPP Subpart PPP—Standard of Performance for Wool Fiberglass Insulation Manufacturing Plants