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Table 3 Spearman’s correlation coefficients between air pollutants and meteorological conditions on case daysa

From: Short-term exposure to ambient air pollution and pneumonia hospital admission among patients with COPD: a time-stratified case-crossover study

 

PM2.5

PM10

SO2

NO2

CO

O3

Temperature

PM10

0.96

–

–

–

–

–

–

SO2

0.60

0.63

–

–

–

–

–

NO2

0.67

0.69

0.43

–

-

-

-

CO

0.55

0.50

0.26

0.60

–

–

–

O3

0.34

0.39

0.36

0.07

− 0.15

–

–

Temperature

− 0.28

− 0.21

− 0.03

− 0.27

− 0.43

0.46

–

Relative humidity

− 0.50

− 0.52

− 0.53

− 0.16

− 0.15

− 0.43

0.26

  1. PM2.5 particulate matter with an aerodynamic diameter ≤ 2.5 µm, PM10 particulate matter with an aerodynamic diameter ≤ 10 µm, SO2 sulfur dioxide, NO2 nitrogen dioxide, CO carbon monoxide, O3 ozone
  2. aAll pairwise correlation coefficients were statistically significant (p < 0.001)