Determination of Interesting Toxicological Elements in PM_2.5 by Neutron and Photon Activation Analysis

Table 7

Levels (ng m⁻³) of selected elements investigated along four decades in downtown Rome.

	PM10
	1965–78	1989–92	2000–02
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