{"data":{"id":"us/40-cfr-appendix-a-to-subpart-c-of-part-53","jurisdiction":"us","citation":"40 CFR Appendix A to Subpart C of Part 53","heading":"Appendix A to Subpart C of Part 53—References","body":"(1) American National Standard Quality Systems for Environmental Data and Technology Programs—Requirements with guidance for use, ANSI/ASQC E4-2004. Available from American Society for Quality, P.O. Box 3005, Milwaukee, WI 53202 (http://qualitypress.asq.org).\n(2) Quality Assurance Guidance Document 2.12. Monitoring PM 2.5 in Ambient Air Using Designated Reference or Class I Equivalent Methods. U.S. EPA, National Exposure Research Laboratory, Research Triangle Park, NC, November 1998 or later edition. Currently available at http://www.epa.gov/ttn/amtic/pmqainf.html.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 53—AMBIENT AIR MONITORING REFERENCE AND EQUIVALENT METHODS","Subpart C—Procedures for Determining Comparability Between Candidate Methods and Reference Methods"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"6f029d2029c0e0646e92759053ae55690c514df959a6faa8d3d3630c39a3ec23","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-figure-c-4-to-subpart-c-of-part-53","next":"us/40-cfr-53.40"},"notice":"GroundRules: Original legal text. Not legal advice."}