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Monitoring, analysis, and modelling are essential elements of an air quality management plan. It is beneficial to deal with them as an integrated whole. The paper describes Ciudad Chihuahua, Mexico, the development of a new, user friendly, integrated air quality management system (SIMON), and an example of the use of SIMON to examine good" and "poor" mitigation strategies that could be applied to reduce high pollutant concentrations. The system design and architecture are documented. The five major parts of SIMON are described: an emission inventory module, the meteorological data module, an air quality monitoring module, a modelling-planning module, and a reporting module. The practical use of SIMON is demonstrated through its application to mitigate high concentrations of particulates in one area of the city." [ABSTRACT FROM AUTHOR]