Table 2.

Values of the measured concentrations of PM_2.5 chemical components, as mean and standard deviation values of the whole study and of the spring and winter campaigns, separately. Bold values indicate statistically significant differences between seasons: *p < 0.005; **p ≤ 0.001

	Total		Spring		Winter
	Mean	SD	Mean	SD	Mean	SD
ƩPAHs (ng m−3)	5.03	2.30	3.16**	0.53	6.58**	1.03
Ʃoxy-PAHs (ng m−3)	1.44	0.24	1.44	0.14	1.45	0.31
PM2.5 (μg m−3)	18.2	14.7	8.29**	3.28	26.7**	15.5
SO42− (μg m−3)	1.36	0.98	1.48	1.00	1.26	0.98
NO3− (μg m−3)	4.85	6.43	0.48**	0.21	8.67**	6.82
NH4+ (μg m−3)	2.35	2.43	0.85**	0.41	3.70**	2.72
EC (μg m−3)	0.91	0.58	0.43**	0.06	1.31**	0.51
OC (μg m−3)	4.02	2.45	2.21**	0.63	5.51**	2.39
Levoglucosan (ng m−3)	251.2	317.7	10.6**	7.8	510.4**	279.9
Cl− (μg m−3)	-	-	-	-	0.23	0.09
K+ (μg m−3)	-	-	-	-	0.31	0.21
Ca2+ (μg m−3)	-	-	-	-	0.9	0.4
As (ng m−3)	0.26	0.17	0.17*	0.07	0.35*	0.19
Fe (ng m−3)	57.1	29.9	49.0	19.1	65.2	40.7
V (ng m−3)	0.72	0.94	0.27*	0.14	1.17*	0.87
Zn (ng m−3)	15.4	12.3	6.9**	2.6	22.9**	12.6
Cd (ng m−3)	0.07	0.06	0.03**	0.01	0.11**	0.06
Pb (ng m−3)	2.67	2.08	1.29**	0.47	3.88**	2.20
Sn (ng m−3)	1.56	1.47	0.66**	0.22	2.34**	1.66
Sb (ng m−3)	0.52	0.20	0.41	0.09	0.58	0.22
La (ng m−3)	0.07	0.06	0.04*	0.02	0.11*	0.07
Mn (ng m−3)	-	-	1.45	0.33	-	-
OPVDTT (nmol min−1 m−3)	0.21	0.21	0.08**	0.03	0.32**	0.15
OPVAA (nmol min−1 m−3)	0.52	0.41	0.28**	0.21	0.72**	0.36
OPmDTT (nmol min−1 μg−1)	0.017	0.031	0.004*	0.004	0.022*	0.022
OPmAA (nmol min−1 μg−1)	0.034	0.031	0.033	0.023	0.035	0.037