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Table 2 Distribution of the element-to-PM 2.5 mass proportions and interquartile range (IQR) of the monthly averages of these ratios

From: Elemental concentrations of ambient particles and cause specific mortality in Santiago, Chile: a time series study

Element (ng/m3) 5% 25% 50% 75% 95% N IQR of monthly ratios
Al 0.55 1.64 3.26 6.68 12.71 816 4.94
Na 0.47 2.36 6.29 14.21 27.71 797 11.42
Br 0.09 0.19 0.31 0.62 2.33 814 0.39
Ca 1.02 2.38 4.00 5.89 9.50 816 3.36
Cl 0.16 0.80 2.20 5.16 15.87 720 4.64
Cr 0.03 0.06 0.10 0.14 0.26 800 0.04
Cu 0.26 0.54 0.75 1.08 1.94 815 0.36
Fe 2.92 6.37 9.07 12.41 18.70 816 5.23
K 3.58 5.97 8.30 12.02 23.43 816 7.23
Mn 0.13 0.29 0.46 0.65 1.04 816 0.21
Ni 0.01 0.02 0.03 0.05 0.09 751 0.02
Pb 0.31 0.64 0.99 2.63 8.24 815 2.74
Se 0.01 0.04 0.08 0.15 0.33 755 0.10
Si 1.91 4.44 8.56 16.42 28.68 816 13.47
S 9.59 22.79 36.72 52.13 81.10 816 22.33
Zn 0.79 1.39 2.05 2.88 4.96 816 0.93