Site

Fe

Mn

Pb

Zn

Cu

Reference

Cangzhou, China

2195.8

153.6

31.3

148.7

116.4

This study

Beijing, China

1323.1

58.8

154.3

185.3

185.2

(Qiao et al., 2017)

Tianjin, China

1310

100

230

730

120

(Zhao et al., 2013)

Shijiazhuang, China

1840

160

430

810

60

(Zhao et al., 2013)

Baoding, China

/

38.6

158.9

226.5

99.6

(Lei et al., 2021)

Zhengzhou, China

301.9

41.3

63.2

97.5

30.5

(Yan et al., 2019)

Nanchang, China

/

226.1

468.7

1141.1

343.4

(Zheng et al., 2018)

Guilin, China

/

173

102

132

8.9

(Mo et al., 2019)

Guiyang, China

/

18

20

34

8.8

(Zheng et al., 2020)

Fuzhou, China

563.2

47.6

46.6

232.6

164.9

(Xu et al., 2012)