Author(s)

J. Gaytan-Iniestra, A.R. Wojcik & P.E. Arroyo-Lopez

Abstract

The city of Toluca is located 60 km. to the west of Mexico City, and due to its accelerated demographic and industrial growth, one of the main concerns of the State Environmental Department is the potential increment in air pollution indexes. Records about important pollutants have been collected every hour since April 1993 for seven locations in the zone. These data have been analyzed statistically looking for trend changes and potential differences among locations. Due to the great amount of missing data, only two locations provided enough weekly averages to allow for statistical analysis. The daily data were deseasonalized and weekly averages used to estimate missing data via ARIMA models. To construct forecasts and to

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