Code of Federal Regulations Title 40. Protection of Environment 40 CFR Pt. 53, Subpt. C, Tbl. C-4 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

Acceptable concentration range (R_j), μg/m³

15-300

3-200

3-200

3-200

3-200

3-200

Minimum number of test sites

2

1

2

4

2

4

Minimum number of candidate method samplers or analyzers per site

3

3

3 ¹

3 ¹

3 ¹

3 ¹

Number of reference method samplers per site

3

3

3 ¹

3 ¹

3 ¹

3 ¹

Minimum number of acceptable sample sets per site for PM₁₀ methods:

R_j < 60 μg/m³

3

R_j > 60 μg/m³

3

Total

10

Minimum number of acceptable sample sets per site for PM_2.5 and PM_10–2.5 candidate equivalent methods:

R_j < 30 μg/m³ for 24-hr or R_j < 20 μg/m³ for 48-hr samples

3

R_j > 30 μg/m³ for 24-hr or R_j > 20 μg/m³ for 48-hr samples

3

Each season

10

23

23

23

23

Total, each site

10

23

23 (46 for two-season sites)

23

23 (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, maximum

5 μg/m³ or 7%

2 μg/m³ or 5%

10% ²

10% ²

10% ²

10% ²

Precision of PM_2.5 or PM_10–2.5 candidate method, CP, each site

10% ²

15% ²

15% ²

15% ²

Slope of regression relationship.

1 ± 0.10

1 ± 0.05

1 ± 0.10

1 ± 0.10

1 ± 0.10

1 ± 0.12

Intercept of regression relationship, μg/m³

0 ± 5

0 ± 1

Between: 13.55 - (15.05 x slope), but not less than -1.5; and 16.56 - (15.05 x slope), but not more than +1.5

Between: 15.05 - (17.32 x slope), but not less than -2.0; and 15.05 - (13.20 x slope), but not more than +2.0

Between: 62.05 - (70.5 x slope), but not less than -3.5; and 78.95 - (70.5 x slope), but not more than +3.5

Between: 70.50 - (82.93 x slope), but not less than -7.0; and 70.50 - (61.16 x 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 x CCV—for 0.4 ≤ CCV ≤ 0.5; ≥ 0.95—for CCV ≥ 0.5