This technical paper discusses development of an integrated Intelligent Transportation System (ITS) application platform for air quality and congestion management. This tool will provide roadside air quality and congestion measurement and monitoring capabilities to improve transportation management decisions in support of improving air quality through efficient traffic management and control of the traffic signals and ITS devices. Additionally, it will provide a forecasting model for planning purposes and an expert system to select appropriate strategies to respond to scenarios representing various combinations of network congestion, weather and air quality conditions. A prototype will be deployed at an existing site to evaluate effectiveness of the system in meeting the proposed objectives.