Table 2 Characteristics of the air pollutants in different cities

CO

Tianjin

1.72 (1.37–2.29)

250

Xi’an

1.70 (1.26–2.47)

211

Xingtai

1.54 (1.11–2.46)

198

–

–

–

Guangzhou

1.00 (0.89–1.19)

27

Fuzhou

0.73 (0.63–0.94)

10

Guiyang

0.77 (0.63–0.95)

10

NO₂

Xingtai

61.79 (47.67–82.99)

232

Chengdu

51.76 (42.45–65.44)

178

Ji’nan

49.70 (35.48–68.42)

162

–

–

–

Kunming

36.50 (28.90–44.51)

26

Dalian

28.94 (23.58–37.33)

17

Guiyang

31.05 (24.03–39.59)

16

O₃

Wuhan

79.06 (51.67–110.33)

181

Shanghai

77.55 (58.89–96.12)

165

Ji’nan

72.48 (40.46–102.40)

160

–

–

–

Zunyi

64.79 (57.48–73.13)

31

Hefei

55.23 (38.77–67.33)

29

Fuzhou

49.42 (39.63–62.93)

27

PM₁₀

Xingtai

251.43 (172.92–359.36)

308

Ji’nan

166.03 (120.06–237.78)

215

Xi’an

143.05 (98.79–218.76)

173

–

–

–

Shenzhen

59.83 (38.44–94.45)

19

Kunming

72.19 (46.77–99.89)

15

Fuzhou

62.29 (45.56–87.95)

14

PM_2.5

Xingtai

119.29 (78.09–196.94)

258

Ji’nan

84.93 (59.76–129.42)

192

Tianjin

80.58 (54.03–113.46)

178

–

–

–

Shenzhen

36.92 (21.18–58.11)

27

Fuzhou

31.65 (20.53–49.52)

12

Kunming

37.88 (24.00–53.04)

9

SO₂

Xingtai

84.58 (51.71–137.72)

291

Ji’nan

61.47 (40.98–104.46)

256

Shenyang

40.98 (24.26–98.12)

169

–

–

–

Wenzhou

20.14 (13.46–29.00)

13

Guangzhou

20.19 (15.07–26.22)

6

Shenzhen

9.83 (7.43–14.57)

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