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The results described here were funded partly by the Bulgarian National Science Fund under projects Ph-63, Ph-447, Ph-811 and the European Commission under the project EARLINET-ASOS, grant RICA-025991 EC FP6. The authors thank the NOAA Air Resources Laboratory (ARL) for the provision of the HYSPLIT backward trajectories. We also thank the Barcelona Supercomputing Center for Dust Regional Atmospheric Model (DREAM) and for the provision of Saharan dust forecast maps.

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