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. 2019 Aug 28;5(8):e02270. doi: 10.1016/j.heliyon.2019.e02270

Table 6.

Correlations (Pearson coefficient) between the concentrations of elements and anions analyzed in the PM10 captured indoor and outdoor.

Indoor Correlations
As Ni Cd Pb Al B Zn Mg Sb Fluoride Chlorite Chloride Nitrate Sulphate
Outdoor Correlations As 0.68** -0.18 -0.25 0.64** -0.14 0.17 0.66** 0.13 0.20 0.20 0.34** 0.15 0.18
Ni 0.52** -0.37 -0.37** 0.63** -0.50** -0.02 0.55** -0.07 0.29* 0.34* 0.22 0.27* 0.17
Cd 0.29 0.12 0.88** -0.27* 0.52** 0.25 -0.18 0.04 0.14 0.26 0.09 -0.17 -0.07
Pb 0.53** 0.23* 0.02 -0.29* 0.47** 0.19 -0.19 0.05 0.05 0.19 0.05 -0.21 -0.14
Al 0.36** 0.37** 0.14 0.23* -0.30* 0.36** 0.89** -0.28** -0.06 0.20 0.07 -0.05 -0.21
B 0.27* 0.01 0.22 0.20 0.46** 0.53** -0.18 0.36** 0.20 -0.15 0.17 -0.12 0.10
Zn 0.66** 0.25* 0.44** 0.24* 0.29* 0.59** 0.35** 0.08 0.19 0.09 0.08 -0.29* -0.18
Mg 0.45** 0.36** 0.45** 0.20 0.79** 0.29* 0.44** -0.25* -0.08 0.26 0.09 -0.10 -0.11
Sb 0.32** 0.18 0.04 0.12 0.12 0.07 0.34** 0.27* 0.36** -0.14 0.41** 0.07 0.33*
Fluoride 0.43** 0.30** 0.22 0.40** 0.43** 0.15 0.26* 0.40** 0.19 0.54** 0.59** 0.31* 0.58**
Chlorite 0.29* 0.15 0.28 -0.02 0.04 -0.03 0.21 0.36** 0.26* 0.47** 0.33* 0.28* 0.32**
Chloride 0.12 0.24* 0.36* 0.14 0.02 -0.31** -0.11 0.37** 0.04 0.36** 0.41** 0.47** 0.72**
Nitrate 0.04 0.18 -0.06 --- 0.02 -0.06 -0.02 0.07 0.01 0.18 -0.17 0.15 0.66**
Sulphate 0.32* 0.45** 0.10 0.19 0.11 -0.02 0.22 0.23* 0.03 0.24* -0.12 0.09 0.52**

* Significative correlation; ** Good correlation.