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Table 2 Correlations (Pearson’s r) and summary statistics of criteria pollutants (1999–2015) in the NHIS cohort

From: Air pollution and mortality in a large, representative U.S. cohort: multiple-pollutant analyses, and spatial and temporal decompositions

 PM2.5PM2.5–10SO2NO2O3COMeanSDIQR
PM2.5 (10 μg/m3)      10.672.373.12
PM2.5–10 (10 μg/m3)0.19     9.774.515.42
SO2 (ppb)0.41−0.34    2.251.011.26
NO2 (ppb)0.560.440.37   10.695.736.72
O3 (ppb)0.330.170.170.11  47.455.316.75
CO (ppm)0.420.560.170.900.04 0.370.100.10
  1. Note: PM2.5, fine particulate matter (particles < 2.5 μm in aerodynamic diameter); PM2.5–10, coarse fraction particulate matter (particles 2.5–10 μm in aerodynamic diameter); SO2, sulfur dioxide; NO2, nitrogen dioxide; O3, ozone, mean for May–September of daily max of eight-hour moving average; CO, carbon monoxide; SD, standard deviation; IQR, interquartile range