Table 2 Summary characteristics of particle component concentration, relative humidity, and temperature

PM _2.5 Major Components

SO₄²⁻ (µg/m³)

2.36

2.21

1.41

0.75

2.87

3.25

3.76

NO₃⁻ (µg/m³)

0.80

0.82

0.26

0.18

0.94

1.15

1.57

NH₄⁺ (µg/m³)

0.75

0.76

0.45

0.25

0.96

1.17

1.49

OC (µg/m³)

1.64

1.72

0.47

0.39

1.92

2.51

3.56

EC (µg/m³)

0.45

0.48

0.16

0.14

0.55

0.76

1.23

PM _2.5 Trace Elements

Zn (ng/m³)

9.29

9.49

3.82

2.72

11.36

14.12

19.18

 V (ng/m³)

1.43

1.70

2.00

1.29

2.54

4.15

6.84

 K (ng/m³)

47.63

47.81

6.20

4.77

50.87

55.83

67.21

Si (ng/m³)

51.15

54.34

17.63

13.79

61.47

83.93

107.14

Pb (ng/m³)

1.96

2.39

1.77

1.07

3.30

4.33

5.52

Ni (ng/m³)

0.98

1.14

0.86

0.63

1.52

2.41

3.03

Fe (ng/m³)

49.72

50.80

22.12

17.20

61.01

82.70

124.43

Cu (ng/m³)

2.47

2.66

1.30

1.15

3.18

5.03

9.92

Ca (ng/m³)

22.68

23.30

6.94

5.59

26.36

34.00

50.17

Br (ng/m³)

2.63

2.63

0.41

0.32

2.83

3.15

3.68

Total PM _2.5 Mass

PM_2.5 (µg/m³)

8.75

8.73

2.80

1.94

10.08

11.96

16.39

Meteorological variables

Relative humidity (%)

64.44

64.53

3.28

2.91

66.03

69.74

77.32

Temperature (℃)

10.09

10.09

1.36

1.05

10.83

11.72

12.86