Table 1 Correlations between six air pollutants under different AQI values.

From: Spatial and temporal variations of air quality and six air pollutants in China during 2015–2017

 

0–50

51–100

PM2.5

PM10

SO2

NO2

CO

O3

PM2.5

PM10

SO2

NO2

CO

O3

AQI

0.76

0.85

0.21

0.34

0.16

0.30

0.81

0.80

0.23

0.34

0.22

0.02

PM2.5

1

0.59

0.18

0.33

0.24

0.01

1

0.49

0.19

0.32

0.25

−0.15

PM10

 

1

0.20

0.30

0.11

0.13

 

1

0.25

0.34

0.17

−0.01

SO2

  

1

0.20

0.18

−0.03

  

1

0.27

0.26

−0.17

NO2

   

1

0.19

−0.19

   

1

0.24

−0.32

CO

    

1

−0.16

    

1

−0.23

O3

     

1

     

1

 

101–150

151–200

AQI

0.65

0.33

0.12

0.15

0.10

−0.12

0.44

0.17

0.06

0.10

0.06

−0.09

PM2.5

1

−0.08

0.14

0.31

0.11

−0.27

1

−0.21

0.16

0.41

0.09

−0.33

PM10

 

1

0.10

0.06

0.01

0.03

 

1

0.02

−0.06

−0.04

0.11

SO2

  

1

0.30

0.20

−0.21

  

1

0.33

0.19

−0.21

NO2

   

1

0.15

−0.36

   

1

0.15

−0.41

CO

    

1

−0.16

    

1

−0.18

O3

     

1

     

1

 

201–300

>300

AQI

0.46

0.39

0.05

0.11

0.11

−0.07

0.37

0.48

−0.07

−0.12

−0.03

0.11

PM2.5

1

−0.13

0.21

0.52

0.25

−0.45

1

0.47

0.14

0.36

0.33

−0.32

PM10

 

1

−0.05

−0.22

−0.11

0.26

 

1

−0.17

−0.32

−0.25

0.25

SO2

  

1

0.36

0.27

−0.23

  

1

0.42

0.50

−0.34

NO2

   

1

0.35

−0.54

   

1

0.81

−0.70

CO

    

1

−0.32

    

1

−0.65

O3

     

1

     

1

  1. Significance at the 0.01 level (P < 0.01).
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