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Environmental Sciences Europe

Table 2 Descriptive statistics of air pollutant concentrations and meteorological variables (lag 0) in nine cities of Sichuan Province, 2017–2019

From: Impact of airborne particulate matter exposure on hospital admission for Alzheimer's disease and the attributable economic burden: evidence from a time-series study in Sichuan, China

Pollutant

Mean ± SD

Min

Max

Percentage

P25

Median

P75

Concentration

 PM2.5 (μg/m3)

45.12 ± 32.37

4.87

22.61

35.82

57.69

264.15

 PM10 (μg/m3)

69.85 ± 43.68

8.38

37.40

57.75

90.57

441.48

 CO (mg/m3)

0.78 ± 0.27

0.17

0.60

0.73

0.91

2.36

 O3 (μg/m3)

84.03 ± 44.30

6.05

51.28

76.15

109.75

322.11

 SO2 (μg/m3)

10.09 ± 4.78

1.15

6.88

9.05

12.02

39.00

 NO2 (μg/m3)

33.36 ± 17.45

3.07

19.70

30.59

44.08

127.10

 Meteorological factors

 Temperature (°C)

17.44 ± 7.30

1.02

10.68

17.89

23.70

33.32

 Relative humidity (%)

77.71 ± 11.41

15.52

69.95

78.72

86.74

99.76

  1. SD, Standard Deviation; PM2.5, particulate matter ≤ 2.5 μm in aerodynamic diameter; PM10, particulate matter ≤ 10 μm in aerodynamic diameter; CO, carbon monoxide; O3, ozone; SO2, sulfur dioxide; NO2, nitrogen dioxide; P25, 25th percentile; Median, 50th percentile; P75, 75th percentile
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