4 research outputs found
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Introducing the RZ model for definition and optimization of the boundary of low emission zones
Poor urban air quality is one of the most pressing environmental problems and the rapid growth in the number of motor vehicles is a major contributor to it. To tackle this problem, Low Emission Zones (LEZ) were introduced and they have been applied in many of the mega cities around the world. Yet, a scientific approach to design the boundaries of LEZs is missing. This study develops an innovative model to address this gap, using total Vehicle Kilometers Traveled (VKT) as the basis. The model allows defining and/or optimizing the LEZ boundaries. It is applied for Tehran metropolitan area, as a case study, and the results show the optimality of the existing LEZ boundaries, however, they challenge the efficiency of the proposed policies on modifying current boundaries
Long-Term Air Pollution Responses to Transportation Policies in the Tehran Metropolitan Area
Transportation networks respond differently to applied policies. The Tehran Metropolitan Area has one of the most complex networks with complex users, which has experienced many of these policies change within the past decades. In this study, some of these policies and their effect on air pollution is investigated. The goal is to pinpoint the variables which have the most effect on various transportation models and investigate how new policies should be focused. In order to do so, long-term variations of air pollution monitoring stations were analyzed. Results show that the most significant parameter that may affect air pollution is users' behavior due to the lack of a public transportation network and its level of comfort. The results of this study will be useful in developing new policies and evaluating their long-term consequences in appropriate models