Table C-4 to Subpart C - Test Specifications for PM10 and PM2.5 Methods

SpecificationPM10PM2.5Class IClass IIAcceptable concentration range (Rj), μg/m330-30010-20010-200Minimum number of test sites212Number of candidate method samplers per site333Number of reference method samplers per site333Minimum number of acceptable sample sets per site for PM10:Rj < 80 μg/m33Rj > 80 μg/m33Total10Minimum number of acceptable sample sets per site for PM2.5:Single test site for Class I candidate equivalent methods:Rj < 40 μg/m3 for 24-hr or Rj < 30 μg/m3 for 48-hr samples3Rj > 40 μg/m3 for 24-hr or Rj > 30 μg/m3 for 48-hr samples3Sites at which the PM2.5/PM10 ratio must be > 0.75:Rj < 40 μg/m3 for 24-hr or Rj < 30 μg/m3 for 48-hr samples3Rj > 40 μg/m3 for 24-hr or Rj > 30 μg/m3 for 48-hr samples3Sites at which the PM2.5/PM10 ratio must be < 0.40:Rj < 30 μg/m3 for 24-hr or Rj < 20 μg/m3 for 48-hr samples3Rj > 30 μg/m3 for 24-hr or Rj > 20 μg/m3 for 48-hr samples3Total, each site1010Precision of replicate reference method measurements, Pj or RPj respectively, maximum5 μg/m3 or 7%2 μg/m3 or 5%2 μg/m3 or 5%Slope of regression relationship1±0.11±0.051±0.05Intercept of regression relationship, μg/m30±50±10±1Correlation of reference method and candidate method measurements≥0.97≥0.97≥0.97