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Table 3 Spearman correlation coefficients between air pollutants and weather conditions during the 7-year study period (upper right triangle), and during the warm period (lower left triangle)

From: Ambient air pollution is associated with pediatric pneumonia: a time-stratified case–crossover study in an urban area

  PM2.5 PM10 NO2 SO2 O3 Temperature Humidity
PM2.5 1.000 0.915 0.802 0.516 0.427 −0.570 −0.406
PM10 0.915 1.000 0.758 0.472 0.422 −0.544 −0.441
NO2 0.694 0.705 1.000 0.509 0.116 −0.758 −0.323
SO2 0.396 0.392 0.481 1.000 0.209 −0.206 −0.302
O3 0.775 0.750 0.489 0.226 1.000 0.068 −0.397
Temperature −0.355 −0.393 −0.589 −0.163 −0.296 1.000 0.257
Humidity −0.233 −0.266 −0.054 −0.120 −0.303 −0.258 1.000