Table 2 Seasonal average concentrations of meteorological factors in Suzhou area from 2013 to 2017 (\({\overline{\text{x}}}\) ± s).

Spring

16.6 ± 4.5

68.9 ± 4.6

107.0 ± 43.5

161.3 ± 35.1

2.9 ± 0.2

Summer

27.8 ± 3.0

75.3 ± 6.1

189.4 ± 116.2

157.3 ± 72.4

2.7 ± 0.2

Autumn

19.2 ± 4.7

74.3 ± 5.9

121.7 ± 91.0

123.5 ± 46.2

2.4 ± 0.3

Winter

7.0 ± 2.9

71.2 ± 6.4

59.8 ± 36.6

120.3 ± 33.5

2.4 ± 0.5

F value

69.755

3.871

6.599

2.813

8.559

P value

 < 0.001

0.014

0.001

0.048

 < 0.001