The purpose of this research study was to prepare the inventory of emissions from mobile sources in the urban area of the Municipality of Pamplona, Norte de Santander in 2019, the modeling of the dispersion of criteria pollutants in the atmosphere and the identification of the source areas of contamination. Primary information was collected through vehicle counts in the main "hot spots" identified in the city and secondary information obtained from recognized sources, suggested by the national government and recommended by the regulations for the formulation of emissions inventories in Colombia. The characterization and quantification of the emissions was carried out using emission factors (FF.EE) based on the international emissions model (IVE), for later use in modeling using the AERMOD software and evaluating the behavior of the criteria pollutants emitted.. It was determined that the highest emission of criteria pollutants occurs on Point No. 8 Vía Bucaramanga, followed by Point No. 2 Cuatro Esquinas and Point No. 5 Calle Real. The results obtained are consistent with the quantitative logic since they are among the busiest places in the Municipality, however they present very different proportions of vehicle categories. The highest concentrations emitted were recorded for the Carbon Monoxide (CO) pollutants with 101,729 $\mu \mathrm{g}/ \mathrm{m}^{3}$ for a period of (8) hours and 145$,995 \mu \mathrm{g}/ \mathrm{m}^{3}$ for a period of (1) hour; then Nitrogen Dioxide (NO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> ) with a concentration of 13$,993 \mu \mathrm{g}/ \mathrm{m}^{3}$ for a period of (1) hour and 1$,886 \mu \mathrm{g}/ \mathrm{m}^{3}$ for an annual period a concentration of; lastly, the Volatile Organic Compounds (VOC), particles smaller than 10 microns (PM10) and sulfur dioxide (SO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> ).