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. 2006 Jan 13;114(5):655–660. doi: 10.1289/ehp.8578

Table 2.

Spearman’s correlation coefficients between elements of PM2.5, UF, and source-specific PM2.5 (n = 164).

PM2.5 ABS Ca Cl Cu Fe K Mn Ni S Si V Zn UF
ABS 0.70
Ca 0.17 0.30
Cl −0.03 0.02 0.11
Cu 0.42 0.68 0.42 −0.05
Fe 0.38 0.59 0.69 −0.18 0.71
K 0.84 0.73 0.40 −0.10 0.52 0.56
Mn 0.49 0.65 0.48 −0.17 0.65 0.79 0.60
Ni 0.54 0.52 0.37 −0.07 0.39 0.41 0.59 0.13
S 0.85 0.45 0.01 −0.28 0.23 0.21 0.70 0.37 0.43
Si 0.10 0.29 0.71 −0.20 0.45 0.79 0.34 0.54 0.29 −0.26
V 0.59 0.42 0.31 −0.04 0.21 0.29 0.57 0.36 0.88 0.52 0.18
Zn 0.77 0.80 0.29 −0.10 0.66 0.59 0.84 0.73 0.59 0.62 0.30 0.53
UF 0.13 0.57 0.39 −0.11 0.48 0.47 0.24 0.45 0.33 −0.05 0.36 0.16 0.34
Source-specific PM2.5
 Crustal −0.01 0.14 0.80 −0.08 0.36 0.72 0.25 0.49 0.21 −0.12 0.88 0.12 0.19 0.23
 Long-range transported 0.82 0.46 −0.06 −0.18 0.26 0.20 0.70 0.38 0.27 0.90 −0.06 0.38 0.64 −0.19
 Oil combustion 0.35 0.24 0.17 −0.12 0.06 0.10 0.37 0.20 0.86 0.35 0.11 0.86 0.34 0.20
 Salt 0.19 0.07 0.19 0.54 −0.03 −0.17 0.11 −0.11 0.11 0.03 −0.13 0.15 0.07 −0.04
 Local traffic 0.26 0.74 0.20 0.04 0.71 0.47 0.30 0.54 0.21 0.02 0.20 0.04 0.50 0.79

All correlations > 0.17 or < −0.17 are statistically significant at p < 0.05.