This paper presents and discusses the results obtained from the gravimetric and chemical analyses of the 24-hr average dichotomous samples collected from five sites in the El Paso-Cd. Juarez air quality basin between August 1999 and March 2000. Gravimetric analysis was performed to determine the temporal and spatial variations of PM 2.5 (particulate matter less than 2.5 µm in diameter) and PM 2.5-10 (particulate matter less than 10 µm but greater than 2.5 µm in diameter) mass concentrations. The results indicate that ~25% of the PM 10 (i.e., PM 2.5 + PM 2.5-10
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