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Table C–4 to Subpart C of Part 53—Test Specifications for PM 10 , PM 2.5 , and PM 10–2.5 Candidate Equivalent Methods

RegSenseAir QualityCFR RegulationsEnvironmental Protection Agency (EPA)EnvironmentalAir QualityFocus AreaUSAEnglishAir ProgramsCFR Appendix

SpecificationPM 10PM 2.5PM 10–2.5
Class IClass IIClass IIIClass IIClass III
1 Some missing daily measurement values may be permitted; see test procedure.
2 Calculated as the root mean square over all measurement sets.
Acceptable concentration range (R j), µg/m 35–3003–2003–2003–2003–2003–200.
Minimum number of test sites212424.
Minimum number of candidate method samplers or analyzers per site333 13 13 13. 1
Number of reference method samplers per site333 13 13 13. 1
Minimum number of acceptable sample sets per site for PM 10 methods:
R j < 20 µg/m 33
R j > 20 µg/m 33
Total10
Minimum number of acceptable sample sets per site for PM 2.5 and PM 10–2.5 candidate equivalent methods:
R j < 15 µg/m 3 for 24-hr or R j < 8 µg/m 3 for 48-hr samples.33333.
Rj > 15 µg/m 3 for 24-hr or R j > 8 µg/m 3 for 48-hr samples33333.
Each season1023232323.
Total, each site102323 (46 for two-season sites)2323 (46 for two-season sites).
Precision of replicate reference method measurements, P Rj or RP Rj , respectively; RP for Class II or III PM 2.5 or PM 10–2.5 , maximum5 μg/m 3 or 7%.2 μg/m 3 or 5%.10% 210% 210% 210%. 2
Precision of PM 2.5 or PM 10–2.5 candidate method, CP, each site10% 215% 215% 215%. 2
Slope of regression relationship1 ±0.101 ±0.051 ±0.101 ±0.101 ±0.101 ±0.12.
Intercept of regression relationship, µg/m 30 ±50 ±1Between: 13.55—(15.05 × slope), but not less than—1.5; and 16.56—(15.05 × slope), but not more than +1.5Between: 15.05—(17.32 × slope), but not less than—2.0; and 15.05—(13.20 × slope), but not more than +2.0Between: 62.05—(70.5 × slope), but not less than—3.5; and 78.95—(70.5 × slope), but not more than +3.5Between: 70.50—(82.93 × slope), but not less than—7.0; and 70.50—(61.16 × slope), but not more than +7.0.
Correlation of reference method and candidate method measurements≥ 0.97≥ 0.97≥ 0.93—for CCV ≤ 0.4; ≥ 0.85 + 0.2 × CCV—for 0.4 ≤ CCV ≤ 0.5; ≥ 0.95—for CCV ≥ 0.5

[72 FR 32203, June 12, 2007; 89 FR 16386, March 6, 2024]

['Air Programs']
['Air Quality']
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