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. Here, the capability of the chemical weather forecasting model CHIMERE(version 2017r4) to reproduce surface ozone, particulate matter andnitrogen dioxide concentrations in complex terrain is investigated forthe period from 21 June to 21 August 2018. The study area is thenorthwestern Iberian Peninsula, where both coastal and mountainclimates can be found in direct vicinity and a large fraction of theland area is covered by forests. Driven by lateral boundary conditionsfrom the EuropeanCentre for Medium-Range Weather Forecasts (ECMWF) Composition Integrated Forecast System, anthropogenicemissions from two commonly used top-down inventories andmeteorological data from the Weather Research and Forecasting Model,CHIMERE's performance with respect to observations is tested with arange of sensitivity experiments. We assess the effects of (1) anincrease in horizontal resolution, (2) an increase in verticalresolution, (3) the use of distinct model chemistries, and (4) the useof distinct anthropogenic emissions inventories, downscalingtechniques and land use databases. In comparison with the older HTAPemission inventory downscaled with basic options, the updated andsophistically downscaled EMEP inventory only leads to partial modelimprovements, and so does the computationally costly horizontalresolution increase. Model performance changes caused by the choice ofdistinct chemical mechanisms are not systematic either and ratherdepend on the considered anthropogenic emission configuration andpollutant. Although the results are thus heterogeneous in general terms,the model's response to a vertical resolution increaseconfined to the lower to middle troposphere is homogeneous in thesense of improving virtually all verification aspects. For our studyregion and the two aforementioned top-down emission inventories, weconclude that it is not necessary to run CHIMERE on a horizontal meshmuch finer than the native grid of these inventories. A relativelycoarse horizontal mesh combined with 20 model layers between 999 and500 hPa is sufficient to yield balanced results. The chemicalmechanism should be chosen as a function of the intended application.

An exploratory performance assessment of the CHIMERE model (version 2017r4) for the northwestern Iberian Peninsula and the summer season