Table 3 Pearson correlation coefficients (R) and level of significance (p) for DTT activity of species measured within the PM_0.15 and PM_2.5 size ranges

R

p

R

p

EC

0.14

0.77

-0.18

0.70

OC^a

0.92*

0.01

0.79*

0.05

NO₃

-0.63

0.13

-0.81*

0.03

SO4

-0.75*

0.05

-0.80*

0.03

Metals and elements

0.44

0.31

-0.12

0.80

Na

-0.66

0.11

0.03

0.95

Mg

-

-

-0.52

0.29

Al

-0.10

0.83

-0.67

0.10

Si

-0.04

0.93

-0.63

0.13

Cl

0.15

0.75

0.63

0.13

K

-0.06

0.89

-0.69

0.09

Ca

0.55

0.20

-0.62

0.14

Ti

0.66

0.11

0.67

0.10

V

0.32

0.53

0.19

0.76

Cr

0.53

0.28

0.86*

0.05

Mn

0.90*

0.01

0.78

0.12

Fe

0.95*

< 0.01

0.96*

< 0.01

Ni

0.55

0.26

-0.46

0.36

Cu

0.95*

< 0.01

0.94*

< 0.01

Zn

0.93*

< 0.01

0.52

0.23

Br

-0.30

0.52

-0.54

0.21

Sr

0.74

0.09

0.70

0.12

Zr

0.80

0.10

0.86

0.06

Sn

0.71

0.18

-0.10

0.87

Ba

0.89*

0.04

0.92*

0.01

Pb

0.95*

< 0.01

0.88*

0.02