Statistical Tools for Air Pollution Assessment: Multivariate and Spatial Analysis Studies in the Madrid Region

Table 4

Eigenvalues and accumulated variance of the principal components.

Component number	Eigenvalue	Percent of variance	Cumulative percentage
1	3.295	82.4	82.3
2	0.525	13.1	95.5
3	0.165	4.1	99.6
4	0.014	0.4	100.0