Assessment of mesoscale and microscale simulations of a NO2 episode supported by traffic modelling at microscopic level

The Science of the Total Environment
Roberto San JoséR M Gonzalez-Barras

Abstract

The aim of this work is to simulate with high accuracy an episode of high NO2 pollution during December 2016 in the city of Madrid (Spain). For this purpose, a multiscale modelling system has been implemented that includes a mesoscale model (WRF/Chem) up to a horizontal resolution of 1 km and a computational fluid dynamics model (CFD; MICROSYS) with a resolution of 5 m. For the calculation of traffic emissions, a traffic simulation has been previously conducted with the SUMO microscopic model, calibrated from data measured with traffic counters. We show a substantial improvement in the results obtained with 5 m resolution with respect to those of 1 km, reproducing very closely the daily peaks of NO2 concentrations since a very detailed traffic emission source is being used and the CFD reproduces the interactions between the air flow and the buildings. The modelling system presented can be used as a tool to evaluate different emission reduction strategies at street level, as it would allow to have an orientation on their effectiveness without having to implement them.

References

Mar 9, 2013·Atmospheric Environment·Sean D BeeversDavid C Carslaw
Mar 19, 2014·The Journal of Allergy and Clinical Immunology·Byoung-Ju KimSoo-Jong Hong
Oct 20, 2015·Environmental Pollution·Jaana I HalonenCathryn Tonne
Mar 10, 2018·International Journal of Environmental Research and Public Health·Yang WangRaufdeen Rameezdeen
Apr 21, 2018·International Journal of Environmental Research and Public Health·Lu BaiHaiyan Lu
Mar 16, 2019·Nature Communications·Andrew CaplinGeorge Thurston

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