Summary of Applicable Requirements for Reference and Equivalent Methods for Air Monitoring of Criteria Pollutants

Pollutant Reference or equivalent Manual or automated Applicable appendix of part 50 of this chapter Applicable subparts of this part A B C D E F SO 2 Reference Manual A-2 Automated A-1 ✓ ✓ Equivalent Manual A-1 ✓ ✓ Automated A-1 ✓ ✓ ✓ CO Reference Automated C ✓ ✓ Equivalent Manual C ✓ ✓ Automated C ✓ ✓ ✓ O 3 Reference Automated D ✓ ✓ Equivalent Manual D ✓ ✓ Automated D ✓ ✓ ✓ NO 2 Reference Automated F ✓ ✓ Equivalent Manual F ✓ ✓ Automated F ✓ ✓ ✓ Pb Reference Manual G Equivalent Manual G ✓ ✓ Automated G ✓ ✓ PM 10 -Pb Reference Manual Q Equivalent Manual Q ✓ ✓ Automated Q ✓ ✓ PM 10 Reference Manual J ✓ ✓ Equivalent Manual J ✓ ✓ ✓ Automated J ✓ ✓ ✓ PM 2.5 Reference Manual L ✓ ✓ Equivalent Class I Manual L ✓ ✓ ✓ Equivalent Class II Manual L 1 ✓ 2 ✓ ✓ 1 2 ✓ Equivalent Class III Automated L 1 ✓ ✓ ✓ 1 ✓ PM 10-2.5 Reference Manual L, 2 O ✓ ✓ Equivalent Class I Manual L, 2 O ✓ ✓ ✓ Equivalent Class II Manual L, 2 O ✓ 2 ✓ ✓ 1,2 ✓ Equivalent Class III Automated 1 L, 1 2 O ✓ ✓ ✓ 1 ✓ 1 Some requirements may apply, based on the nature of each particular candidate method, as determined by the Administrator. 2 Alternative Class III requirements may be substituted. [89 FR 16382, Mar. 6, 2024]