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Table 7 Levels (ng m -3 ) of selected elements in PM 10 investigated along four decades in downtown Rome

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

   PM10  
  1965-78 1989-92 2000-05
As 4.00   1.35
Br 70 50 22
Cd 0.751   0.520
Co 0.498 0.523 0.379
Cr 16 2.3 7.28
Hg 0.131 0.092 1.07
La 2.04 0.803 0.188
Ni 8.01 1.72 4.54
Pb 270 172 92
Sb 1.99 2.13 9.22
Se 0.533 0.091 0.692
Th 0.911 0.723 0.229
V 14 4.82 4.02
Zn 190 28 80