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Stara Zagora is one of the biggest towns in Bulgaria located in the middle of the country. In the summer of 2004 two very high level SO2 pollution events happened there, leading to serious discontent among the population. Analogous events happened in 2005, too. An attempt for numerical study of one of these episodes – from 8 to 11 of July 2005 is the subject of the present paper. The Models-3 system was applied for simulation and analysis of the episode with a sequential downscaling to a horizontal resolution of...

Some studies of the MM5/CMAQ modeling system sensitivity to changes of the emissions of ozone precursors are presented in the paper. Tree domains were set over Europe with resolution 90-30-10 km. The most inner domain embraces entirely Romania, Bulgaria and Greece. MM5 was run over these domains for June 2000 with NCEP 1x1 degree Global Analysis data. MM5 was run on the external grids in a “two-way nesting” and over the finer grid in a “one-way nesting” mode. EMEP inventory grid data and its 16.67 km deseg...

The special geographical situation of Isfahan and its location in a depression as well as gathering pollutants in the air has turned Isfahan to one of the most polluted cities in Iran. In winter, Isfahan has the most pollutants in the air. In summer and autumn, it has a high level of pollutants. But in spring, the city has healthy air. The synoptic study of the air indicates that there is a high pressure center in Isfahan which is the result of the strengthening and spread of Siberia high pressure center and the s...