A large part of the population living in cities is exposed to ozone levels above the EU air quality target value. The CityChem extension of the urban air quality model EPISODE enables a detailed treatment of the atmospheric chemistry in urban areas and the near-field dispersion close to industrial stacks and in street canyons. The application of the model in the city of Hamburg (Germany) shows good performance for ozone, nitrogen dioxide and particulate matter at air quality monitoring stations. Features of the model that facilitate its application to urban air quality in cities worldwide include integrated utilities for input preparation and output processing, moderate computational demand, photochemistry options (ozone formation studies), high spatial and temporal resolution, and demonstrated fitness for policy use.
Find the article here
Karl, M., Walker, S.-E., Solberg, S., and Ramacher, M.O.P. The Eulerian urban dispersion model EPISODE. Part II: Extensions to the source dispersion and photochemistry for EPISODE-CityChem v1.2 and its application to the city of Hamburg. Geosci. Model Dev. 2019, 12, 3357–3399, https://doi.org/10.5194/gmd-12-3357-2019.