Table A–1 to Subpart A of Part 53—Summary of Applicable Requirements for Reference and Equivalent Methods for Air Monitoring of Criteria Pollutants

...

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.
Pollutant	Reference or equivalent	Manual or automated	Applicable appendix of part 50 of this chapter	Applicable subparts of this part
Pollutant	Reference or equivalent	Manual or automated	Applicable appendix of part 50 of this chapter	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 ✓		✓	✓
	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, O	✓		✓		✓	¹ ✓

[75 FR 35597, June 22, 2010; 89 FR 16382, March 6, 2024]

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