Terms of formation, amount, spatial distribution of tropospheric ozone and the contribution of biogenic sources of VOC to ozone precursors were studied using numerical model for summer photochemical smog simulation (SMOG model). Biogenic emissions of VOC were estimated using semi-empirical model proposed by Guenther et al. (1995). North-eastern part of the Czech Republic (Hruby Jesenik area) was selected as a model domain and comparison of two different model runs with measured data from this area is presented. Only antro-pogenic emissions of VOC were taken into account in the first run of the model whereas biogenic emissions of VOC were added into model inputs in the second run.
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