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Table 2 Synoptic table (mean value, min-max values and standard deviation) of elements concentration (ng m -3 ) determined in PM 2.5 in downtown Rome (LOD: limit of detection; * expressed as pg m -3 ; ** expressed as μg m -3 )

From: Deep investigation on inorganic fraction of atmospheric PM in Mediterranean area by neutron and photon activation analysis

Element PM2.5
  Mean Min-Max St. dev.
As 1.06 0.121-2.76 0.044
Au 0.009 0.000-0.050 0.012
Ba 3.76 1.91-6.45 2.38
Br 17.1 3.20-50.4 13.9
Ce 0.130 0.033-0.335 0.089
Co 0.167 0.077-0.331 0.065
Cr 3.03 1.29-6.40 1.30
Cs 0.047 0.004-0.124 0.037
Eu* 1.14 1.12-1.16 0.029
Fe** 0.074 0.005-0.212 0.059
Hf 0.018 0.006-0.032 0.010
Hg 0.818 0.195-2.12 0.655
La* 22.6 8.73-53.3 10.5
Mo 0.748 0.017-3.04 0.699
Nd <LOD   
Ni 3.54 1.91-5.82 1.45
Rb 1.82 0.416-3.74 1.07
Sb 3.60 0.690-12.6 3.24
Sc* 3.14 0.208-7.49 2.41
Se 0.567 0.116-1.55 0.415
Sm* 3.88 0.208-7.78 2.13
Th 0.027 0.007-0.041 0.010
W 0.636 0.062-2.86 0.682
Yb 0.011 0.003-0.027 0.007
Zn 58.0 4.78-252 61.3