Aerosol in ambient air represents a major environmental problem. Frequent violation of PM10 limit values is reported from most parts of Europe.

According to the annual ambient air quality assessment provided by the Czech Hydrometeorological Institute, in 2005 ca 66 % of the Czech population was exposed to ambient PM10 concentrations exceeding the limit values. The limit value for 24-hour and annual mean concentration were exceeded over 35 % and 1,5 % of the Czech territory, respectively. The increased total level of air pollution is reflected by the fact, that the increase in PM10 concentrations in 2005 was recorded also at rural sites.

The aim of the project is to improve the characterization of PM10 fraction focussing on secondary particles, to propose a chemical model of secondary particles formation and identification of sources, and application and verification of dispersion model over the territory of the Czech Republic.