Lagrangian modelling evaluation of the NOx pollution reduction due to electric vehicles introduction

In this paper, the problem of the atmospheric pollution due to the traffic emission from a large freeway is faced. To this aim, numerical simulations were performed and compared with measured data in a real case. The Lagrangian particle model includes a simple chemical scheme for the reactions between NOx and ozone. The results, compared with a field experiment taken in the literature, show that the parameterisation of the segregation improves the model performances concerning NO₂ and O₃ in the first 300 m. Then the pollution reduction obtained introducing the electric vehicle is evaluated. Within the limits of the simple chemistry scheme and the particular meteorological and emissions conditions, it is found that the reduction is limited to a distance of about 100 m from the source.