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Based on 3D modelling tools, an extensive database was created and used for differentstudies of atmospheric composition. The simulations were based on the US EPA Model-3 system. The models in the system were adapted and validated for Bulgaria. This gavethe opportunity to conduct extensive studies on a fully competitive modern level of theclimate of atmospheric composition in the country. On this basis, a statistically significantensemble of Air Quality indexes (AQI) was calculated, and their typical recurrence,spa...

The atmospheric composition research was based on extensive computer simulations carried out with good resolution using up-to-date modelling tools and detailed and reliable input data. Extensive numerical simulations of the atmospheric composition fields in Bulgaria have been performed using the US EPA Model-3 system used as a modelling tool for 3D simulations. The extensive data base that was created from the simulations was used for different studies of the atmospheric composition. The air pollution pattern is f...