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Table 2 Pearson correlation coefficients (R) and level of significance (p) for DTT activity with different PM species

From: Relationship between redox activity and chemical speciation of size-fractionated particulate matter

Species R p
EC 0.26 0.30
OC 0.12 0.64
OC (excluding two unrealistic values) 0.87* < 0.01
NO3 -0.45 0.06
SO4 -0.08 0.75
Metals and elements -0.19 0.45
PAH 202–228 (FLU, PYR, BaA, CHR) 0.57* 0.04
PAH 252 (BkF, BbF, BaP) 0.92* < 0.01
PAH 276–278 (BghiP, IcdP, dBahA) 0.95* < 0.01
  1. * indicates significance at the p = 0.05 level