PM10and gaseous pollutants trends from air quality monitoring networks in Bari province: principal component analysis and absolute principal component scores on a two years and half data set

Table 2 Principal Component Analysis loadings for all the sites investigated during January 2007

	Viale Archimede, Bari (urban site)			San Nicola sport stadium, Bari (suburban site)			Viale King, Bari (urban site)
	PC1	PC2	PC3	PC1	PC2	PC3	PC1	PC2	PC3
*NOx*	0.14	0.84	0.01	0.90	0.02	0.02	0.09	0.84	0.04
*Benzene*	0.75	0.06	0.13	0.07	0.77	0.13	0.70	0.14	0.14
*Toluene*	0.75	0.09	0.09	0.53	0.18	0.12	0.84	0.09	0.04
CO	0.67	0.23	0.00	0.48	0.29	0.10	0.30	0.43	0.15
*PM10*	0.06	0.01	0.93	0.06	0.12	0.82	0.08	0.05	0.86
*Eigenvalues*	2.37	1.22	1.17	2.04	1.37	1.19	2.02	1.55	1.23
% *variance explained*	47.3	24.5	23.4	40.9	27.5	23.9	40.5	31.1	24.7
	Altamura, prov. of Bari (urban site)			Andria, prov. of Bari ( urban site)			Monopoli, prov. of Bari ( urban site)
	PC1	PC2	PC3	PC1	PC2	PC3	PC1	PC2	PC3
*NOx*	0.84	0.03	0.11	0.87	0.11	0.01	0.91	0.00	0.03
*Benzene*	0.22	0.10	0.66	0.33	0.47	0.17	0.68	0.19	0.05
*Toluene*	0.34	0.27	0.31	0.24	0.61	0.13	0.05	0.01	0.95
CO	0.89	0.00	0.09	0.86	0.12	0.01	0.90	0.03	0.02
*PM10*	0.01	0.94	0.05	0.01	0.06	0.93	0.02	0.96	0.01
*Eigenvalues*	2.30	1.34	1.22	2.31	1.38	1.24	2.55	1.19	1.05
% *variance explained*	46.0	26.8	24.5	46.1	27.6	24.8	51.1	23.9	21.0

ISSN: 2661-801X