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Table 3 Spearman correlation coefficients between air pollutants and weather conditions during the 4-year study period

From: Fine particulate matter constituents associated with emergency room visits for pediatric asthma: a time-stratified case–crossover study in an urban area

 

PM10

PM2.5

Nitrate

Sulfate

Organic carbon

Elemental

carbon

Temperature

Humidity

PM10

1.000

0.909

0.669

0.774

0.731

0.568

−0.493

−0.410

PM2.5

 

1.000

0.793

0.908

0.822

0.699

−0.504

− 0.406

Nitrate

  

1.000

0.680

0.833

0.643

−0.580

−0.269

Sulfate

   

1.000

0.673

0.592

−0.403

−0.359

Organic carbon

    

1.000

0.732

−0.536

−0.377

Elemental carbon

     

1.000

−0.376

−0.277

Temperature

      

1.000

0.315

Humidity

       

1.000