Challenges in Proper Input Database for the Estimation of Road Transport Emission of Pollutants in a Developing Country
Vladimir Momcilovic, University of Belgrade - Faculty of Transport and Traffic Engineering, Aleksandar Manojlovic, University of Belgrade - Faculty of Transport and Traffic Engineering
In road transport emission estimation high-quality input databases are a must. Due to an incomplete vehicle registration database of questionable reliability in Serbia, surveys were conducted and new data sources were identified.
The road transport impact on air pollution in the Republic of Serbia was quantified according to UNFCCC requirements. The importance of such quantification is primarily reflected in setting the reference values to assess the environmental effects of incentive or restrictive measures aimed at improving the vehicle technical condition or to reduce their usage (traffic volumes). Since the basis for a high quality emission estimation is an up-to-date comprehensive vehicle fleet data-set, the authors requested and obtained the official vehicle registration database. Multiple problems have arisen from the database of over 2 million of vehicles: often inadequate vehicle class definition; lack of certain indispensable data: the original EURO emission standard, potential retrofit to a different fuel/propulsion (without an adequate trace in the database) and to which EURO standard; due to personal data protection not reliable split into company and individual cars potentially influencing good mileage assessment (vehicle leasing to individuals is also registered as "company owned" vehicle), etc. Therefore, it was necessary to improve the systematisation of the database with regard to their technical and operation characteristics, i.e. a database enhancement by introducing new significant data for quality estimation of pollutants emission (e.g. alternative fuels/drives, Euro standards, annual and total distance travelled, etc.) and a new national fleet classification compliant with the requirements of the model COPERT 4 for motor vehicles’ emission assessment. The necessary data inputs (including origins, responsible persons and/or authorities for input, collection methodology and frequency) were recommended in detail in the paper.
On the basis of relevant international experience, the research (survey) methodology of the distance travelled (mileage) on national and regional levels has been formulated. Two surveys were realized, one in 2010, and another in 2012, both involving drivers at vehicle inspection (roadworthiness) stations, refuelling stations, parking lots and garages and questionnaires sent to numerous transport companies. Relevant values of distance travelled for different vehicle classes (categories, subcategories and emission control technologies) have been determined.
Another challenge was to assess the share of vehicles with poor technical condition influencing the quantity and composition of pollutants emitted, particularly bearing in mind the situation in Serbia: often inadequate, incomplete or not strict enforcement in vehicle inspection (roadworthiness) stations (especially regarding composition and quantities of emitted pollutants). Based on the estimated emissions using COPERT 4, a classification of road transport sectors was made, by their environmental impact, both at current emissions’ quantities and composition, and by their trends in terms of local air pollution and global climate effects.
Association for European Transport