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. 2021 Jan 7;21:66. doi: 10.1186/s12889-020-10065-0

Table 6.

Coherent matrix eigenvalues of multiple atmospheric pollutants model on lag2 days and relevant eigenvectors

PC1 PC2 PC3 PC4
Eigenvalue 3.051 0.462 0.397 0.089
Proportion of variance 0.763 0.116 0.099 0.022
Cumulative proportion of variance 0.763 0.879 0.978 1.000
PM2.5 0.535 −0.196 −0.398 −0.719
PM10 0.529 −0.302 − 0.388 0.691
SO2 0.457 0.885 0.055 0.068
NO2 0.474 −0.294 0.829 −0.026

PC1: the first principal component; PC2: the second principal component; PC3: the third principal component; PC4: the fourth principal component