The municipal district of Paulínia-SP possessas an expressiva industrial park and it constitutes an attractive pole for industrial expansion, presents important signs of environmental degradation in severa! aspects. However, few studies have been accomplished in the sense of evaluating the current situation of air pollution in the area, seeking to develop a knowledge base to subsidize the state in the definition of public politics and even the entrepreneurs in the decision of new investments in the area.The present work has as objective to do a study about air pollution in this area, being made estimates about air quality in whole considered domain, to identify the areas more reached by the effects of pollutants dispersion, as well as, to aid in the planning of the subsequent stage of the work developed in Unicamp that is the air quality monitoring, by means of a mobile laboratory.Estimate of air quality in the area is based on a meticulous air pollutants emission inventory, in three-year meteorological data and in the use of a mathematical model accepted by national and international environmental agencies.Comparisons are accomplished among data measured by an monitoring station of Cetesb (State Environmental Agency -São Paulo) and the data estimated in the study, obtaining a reasonable coherence among the results. From analysis of isoconcentration curves for the severa! pollutants studied it is possible to identify the criticai areas with relationship to air quality alteration, being good as base for planning field measures with the air quality monitoring mobile station.