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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