Open Journal of Air Pollution, 2014, 3, 70-86 Published Online September 2014 in SciRes. http://www.scirp.org/journal/ojap http://dx.doi.org/10.4236/ojap.2014.33008 Evaluating Mitigation Plans over Traffic Sector to Improve NO2 Levels in Andalusia (Spain) Using a Regional-Local Scale Photochemical Modelling System Raúl Arasa1, Antonio Lozano-García2, Bernat Codina1,3 1Air Quality Department, Meteosim S.L., Barcelona, Spain 2Environment and Water Agency of Andalusia, Seville, Spain 3Department of Astronomy and Meteorology, Barcelona, Spain Email:
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[email protected] Received 5 August 2014; revised 1 September 2014; accepted 17 September 2014 Copyright © 2014 by authors and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution International License (CC BY). http://creativecommons.org/licenses/by/4.0/ Abstract In this contribution, we present an evaluation of different mitigation plans to improve NO2 levels in Andalusia, a region in the south of Spain. Specifically, we consider four possible mitigation plans: the effects over NO2 concentration of apply changes in the distribution of Vehicles Park; the effect of realize traffic restrictions (affecting to the density flow of vehicles) over highways and main roads; the effect of replacement of diesel use by natural gas in urban areas; and the effect of ap- plying new velocity limits to access to urban areas. A sophisticated air quality modelling (AQM) system has been used to evaluate these mitigation plans. AQM implemented is composed on WRF meteorological model, an emission model created by the authors and CMAQ photochemical model. AQM analyzes mitigation plans during fifteen episodes of 2011 where NO2 levels were the highest of the year; so we analyze the effect of mitigation plans in worst conditions.