Author(s)

E. Diaz-Frances, M.E. Ruiz & G. Sosa

Abstract

Spatial stratification and multivariate analyses of Mexico City air pollution data E. Diaz-Frances", M.E. Ruiz\ G. Sosa& "Centra de Investigation en Matemdticas, A.P. 402, 36000 Guanajuato, Gto., Mexico ^Gerencia de Ciencias del Ambiente, Instituto Meccano (M feW/eo, A.f. ^^-(90^ 077^0 Mexico, D.F., Mexico ABSTRACT An instrumented airplane flew over Mexico City Metropolitan Area gathering chemical and meteorological data including aerosol concentrations. The data of some pollutants was examined applying Principal Components Analysis and other multivariate statistical techniques resulting in a meaningful representativity of air pollution data, besides a spatial stratification of into well-defined geographical zones. The first two principal components may have a physical interpretation, the first one as a global measure of photochemical pollution while the second component, as an industrial activity and vehicular emission tracer. Additionally, for so

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