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Table 2 Spearman’s correlation coefficients of air pollutants and weather conditions

From: Associations between short-term exposure to gaseous pollutants and pulmonary heart disease-related mortality among elderly people in Chengdu, China

  SO2 NO2 CO O3 PM2.5 Temperature Humidity AP
SO2 1  
NO2 0.474 a 1  
CO 0.615 a 0.678 a 1  
O3 −0.047 a − 0.195 a − 0.383 a 1  
PM2.5 0.622 a 0.785 a 0.817 a −0.205 a 1  
Temperature −0.084 a −0.431 a − 0.474 a 0.680 a − 0.462 a 1  
Humidity −0.446 a −0.137 a − 0.058 a −0.428 a − 0.190 a −0.078 a 1  
AP 0.079 a 0.365 a 0.363 a −0.596 a 0.335 a −0.851 a −0.002 1
  1. aP < 0.05
  2. Abbreviations: SO2 sulfur dioxide, NO2 nitrogen dioxide, CO carbon monoxide, O3 ozone, PM2.5 particulate matter less than 2.5 μm in aerodynamic diameter; AP, atmospheric pressure