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

From: Effects of short-term exposure to ambient airborne pollutants on COPD-related mortality among the elderly residents of Chengdu city in Southwest China

 

PM2.5

SO2

NO2

CO

O3-8h

Temperature

RH

PM2.5

1

      

SO2

0.540 a

1

     

NO2

0.799 a

0.435 a

1

    

CO

0.820 a

0.450 a

0.712 a

1

   

O3-8h

− 0.215 a

0.092 a

− 0.227 a

− 0.368 a

1

  

Temperature

− 0.511 a

− 0.028

− 0.478 a

− 0.551 a

0.712 a

1

 

RH

− 0.109 a

− 0.254 a

− 0.118 a

0.064 a

− 0.510 a

− 0.037

1

  1. aP < 0.05
  2. Abbreviations: PM2.5 particulate matter < 2.5 μm in aerodynamic diameter, SO2 sulfur dioxide, NO2 nitrogen dioxide, CO carbon monoxide, O3-8h daily 8-h mean concentration of ozone, RH relative humidity