{"data":{"id":"us/40-cfr-table-a-1-to-subpart-a-of-part-53","jurisdiction":"us","citation":"40 CFR Table A-1 to Subpart A of Part 53","heading":"Table A-1 to Subpart A of Part 53—Summary of Applicable Requirements for Reference and Equivalent Methods for Air Monitoring of Criteria Pollutants","body":"Pollutant Reference or equivalent Manual or automated Applicable appendix of part 50 of this chapter Applicable subparts of this part\nA B C D E F\nSO2 Reference Manual A-2\nAutomated A-1 ✓ ✓\nEquivalent Manual A-1 ✓ ✓\nAutomated A-1 ✓ ✓ ✓\nCO Reference Automated C ✓ ✓\nEquivalent Manual C ✓ ✓\nAutomated C ✓ ✓ ✓\nO3 Reference Automated D ✓ ✓\nEquivalent Manual D ✓ ✓\nAutomated D ✓ ✓ ✓\nNO2 Reference Automated F ✓ ✓\nEquivalent Manual F ✓ ✓\nAutomated F ✓ ✓ ✓\nPb Reference Manual G\nEquivalent Manual G ✓ ✓\nAutomated G ✓ ✓\nPM10-Pb Reference Manual Q\nEquivalent Manual Q ✓ ✓\nAutomated Q ✓ ✓\nPM10 Reference Manual J ✓ ✓\nEquivalent Manual J ✓ ✓ ✓\nAutomated J ✓ ✓ ✓\nPM2.5 Reference Manual L ✓ ✓\nEquivalent Class I Manual L ✓ ✓ ✓\nEquivalent Class II Manual L 1 ✓ 2 ✓ ✓ 1 2 ✓\nEquivalent Class III Automated L 1 ✓ ✓ ✓ 1 ✓\nPM10-2.5 Reference Manual L,2 O ✓ ✓\nEquivalent Class I Manual L,2 O ✓ ✓ ✓\nEquivalent Class II Manual L,2 O ✓ 2 ✓ ✓ 1,2 ✓\nEquivalent Class III Automated 1 L, 1 2 O ✓ ✓ ✓ 1 ✓\n1 Some requirements may apply, based on the nature of each particular candidate method, as determined by the Administrator.\n2 Alternative Class III requirements may be substituted.","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 A—General Provisions"],"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":"93de009e4a9001aee1dec32a62f104f18ecfda359bb3461ae1315c2b748d0e0d","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-53.16","next":"us/40-cfr-appendix-a-to-subpart-a-of-part-53"},"notice":"GroundRules: Original legal text. Not legal advice."}