title: Assessment of potential improvements on regional air quality modelling related with implementation of a detailed methodology for traffic emission estimation.
abstract: The accuracy and precision of air quality models are usually associated with the emission inventories. Thus, in order to assess if there are any improvements on air quality regional simulations using detailed methodology of road traffic emission estimation, a regional air quality modelling system was applied. For this purpose, a combination of top-down and bottom-up approaches was used to build an emission inventory. To estimate the road traffic emissions, the bottom-up approach was applied using an instantaneous emission model (Vehicle Specific Power - VSP methodology), and an average emission model (CORINAIR methodology), while for the remaining activity sectors the top-down approach was used. Weather Research and Forecasting (WRF) and Comprehensive Air quality (CAMx) models were selected to assess two emission scenarios: (i) scenario 1, which includes the emissions from the top-down approach; and (ii) scenario 2, which includes the emissions resulting from integration of top-down and bottom-up approaches. The results show higher emission values for PM10, NOx and HC, for scenario 1, and an inverse behaviour to CO. The highest differences between these scenarios were observed for PM10 and HC, about 55% and 75% higher (respectively for each pollutant) than emissions provided by scenario 2. This scenario gives better results for PM10, CO and O3. For NO2 concentrations better results were obtained with scenario 1. Thus, the results obtained suggest that with the combination of the top-down and bottom-up approaches to emission estimation several improvements in the air quality results can be achieved, mainly for PM10, CO and O3.
authors.affiliation: University of Aveiro, Centre for Mechanical Technology and Automation (TEMA), Department of Mechanical Engineering, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal. Electronic address: margarida.coelho@ua.pt.
authors.forename: Margarida C
authors.initials: MC
authors.lastname: Coelho
authors.affiliation: University of Aveiro, Centre for Mechanical Technology and Automation (TEMA), Department of Mechanical Engineering, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
authors.forename: Tânia
authors.initials: T
authors.lastname: Fontes
authors.affiliation: University of Aveiro, Centre for Mechanical Technology and Automation (TEMA), Department of Mechanical Engineering, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
authors.forename: Jorge M
authors.initials: JM
authors.lastname: Bandeira
authors.affiliation: University of Aveiro, Centre for Mechanical Technology and Automation (TEMA), Department of Mechanical Engineering, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
authors.forename: Sérgio R
authors.initials: SR
authors.lastname: Pereira
authors.affiliation: University of Aveiro, Centre for Environmental and Marine Studies (CESAM), Department of Environment and Planning, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
authors.forename: Oxana
authors.initials: O
authors.lastname: Tchepel
authors.affiliation: University of Aveiro, Centre for Environmental and Marine Studies (CESAM), Department of Environment and Planning, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
authors.forename: Daniela
authors.initials: D
authors.lastname: Dias
authors.affiliation: University of Aveiro, Centre for Environmental and Marine Studies (CESAM), Department of Environment and Planning, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
authors.forename: Elisa
authors.initials: E
authors.lastname: Sá
authors.affiliation: University of Aveiro, Centre for Environmental and Marine Studies (CESAM), Department of Environment and Planning, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
authors.forename: Jorge H
authors.initials: JH
authors.lastname: Amorim
authors.affiliation: University of Aveiro, Centre for Environmental and Marine Studies (CESAM), Department of Environment and Planning, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
authors.forename: Carlos
authors.initials: C
authors.lastname: Borrego
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution / Q000706:statistics & numerical data*; D004784:Environmental Monitoring; D008956:Models, Chemical; D012044:Regression Analysis; D012621:Seasons; D001335:Vehicle Emissions / Q000032:analysis*
chemical_list: D000393:Air Pollutants; D001335:Vehicle Emissions
keywords: Air quality; Emissions; Numerical modelling; Regional scale; Road traffic