Table 1 Ambient PM_2.5 and CAP samples were collected weekly, and the elemental composition was determined by ICP-MS

Na

0.12 ± 0.02

0.29

1.06 ± 0.41

0.38

Mg

0.94 ± 0.05

2.23

5.65 ± 0.83

2.05

Al

3.09 ± 0.13

7.33

18.83 ± 2.25

6.82

Si

11.51 ± 0.47

27.32

71.42 ± 6.9

25.86

P

0.04 ± 0.01

0.09

0.33 ± 0.09

0.12

S

0.44 ± 0.27

1.05

6.41 ± 5.84

2.32

Cl

0.02 ± 0.03

0.04

0.74 ± 1.01

0.27

K

0.41 ± 0.06

0.97

3.16 ± 0.84

1.14

Ca

21.62 ± 0.64

51.32

139.19 ± 5.96

50.40

Ti

0.94 ± 0.02

2.23

6.28 ± 0.11

2.27

Cr

0.02 ± 0.003

0.06

0.17 ± 0.03

0.06

Mn

0.01 ± 0.01

0.02

0.21 ± 0.29

0.08

Fe

1.5 ± 0.04

3.59

11.7 ± 2.61

4.24

Ni

0.01 ± 0.003

0.03

0.11 ± 0.06

0.04

Cu

0.01 ± 0.002

0.01

0.07 ± 0.06

0.03

Zn

0.06 ± 0.01

0.13

0.96 ± 0.79

0.35

Ga

0.02 ± 0.001

0.04

0.13 ± 0.01

0.05

As

0.24 ± 0.01

0.57

1.63 ± 0.05

0.59

Br

0.003 ± 0.005

0.01

0.18 ± 0.24

0.06

Rb

0.01 ± 0.001

0.02

0.07 ± 0.01

0.02

Sr

0.37 ± 0.02

0.89

2.44 ± 0.07

0.88

Y

0.01 ± 0.001

0.02

0.06 ± 0.01

0.02

Zr

0.2 ± 0.01

0.47

1.4 ± 0.05

0.51

Nb

0.01 ± 0.001

0.02

0.05 ± 0.001

0.02

Sn

0.005 ± 0.004

0.00

0.01 ± 0.01

0.00

Sb

0.005 ± 0.006

0.01

0.04 ± 0.02

0.01

Ce

0.21 ± 0.02

0.51

1.49 ± 0.03

0.54

Pr

0.03 ± 0.01

0.07

0.22 ± 0.02

0.08

Eu

0.05 ± 0.01

0.13

0.37 ± 0.06

0.14

Gd

0.01 ± 0.01

0.02

0.04 ± 0.03

0.01

Tb

0.08 ± 0.01

0.19

0.38 ± 0.18

0.14

Er

0.01 ± 0.005

0.03

0.17 ± 0.15

0.06

Lu

0.02 ± 0.003

0.05

0.23 ± 0.13

0.08

W

0.004 ± 0.003

0.01

0.03 ± 0.02

0.01

Ir

0.002 ± 0.002

0.00

0.002 ± 0.001

0.00

Hg

0.01 ± 0.001

0.02

0.05 ± 0.01

0.02

Pb

0.01 ± 0.006

0.03

0.15 ± 0.1

0.05

Bi

0.002 ± 0.001

0.01

0.03 ± 0.01

0.01

U

0.08 ± 0.02

0.18

0.73 ± 0.16

0.27