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

From: 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

  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