Overview of the Change in NO2 Assessment Maps During the Last 15 Years in Flanders: Problems Encountered and Solutions
During the last 15 years, the official assessment maps in Flanders have improved from a map consisting of only measured data points to a high resolution assessment which covers the complete area and takes into account several types of sources and street canyons. In order to improve this level of detail, multiple steps were taken. First of all, a land use regression model was introduced at an hourly scale at 4 × 4 km2 resolution. Secondly, a Gaussian model was added for both point and line sources, correcting for emission double counting. Finally, a street canyon model was added to the chain, leading to improved resolution in these street canyons. In this work, we will discuss the problems encountered in these years such as how to account for double counting of emissions, how to correct the locations of the simplified road network and how to determine when street canyon calculations must be performed and how we solved them.
- 4.O. Kracht et al., Spatial representativeness of air quality monitoring sites—Outcomes of the FAIRMODE intercomparison exercise, JRC Technical report, in press (2018)Google Scholar
- 6.W. Lefebvre, B. Degraeuwe, C. Beckx, M. Vanhulsel, B. Kochan, T. Bellemans, D. Janssens, G. Wets, S. Janssen, I. de Vlieger, Panis L. Int, S. Dhondt, Presentation and evaluation of an integrated model chain to respond to traffic- and health-related policy questions. Environ. Modell. Softw. 40, 160–170 (2013)CrossRefGoogle Scholar
- 9.TRANSPHORM, Transport related air pollution and health impacts—Integrated methodologies for assessing particulate matter—Deliverable D2.2.4—Spatially distributed source contributions for health studies: comparison of dispersion and land use regression models (2010), http://www.transphorm.eu/Portals/51/Documents/Deliverables/New%20Deliverables/D2.2.4_v6.pdf