CONVENTION ON LONG-RANGE TRANSBOUNDARY AIR POLLUTION EMEP Task Force on Measurements and Modelling Particulate Matter Assessment Report Czech National Contribution Milan Váňa, Jan Horálek, Štěpán Rychlík, Helena Hnilicová Czech Hydrometeorological Institute Paris

Emise

PM10 trend (annual means,  g.m -3)

PM10 trend (annual means,  g.m -3) agglomerations

PM10 trend (annual means,  g.m -3) urban stations

PM10 - annual variation,  g.m -3,

PM10 - annual variation,  g.m -3 agglomerations

PM2,5 - annual variation,  g.m -3, 2005

PM2,5/ PM10 ratio 2005

Poměr Košetice

Conclusions (1) Decreasing trend in the period at all types of stations. This trend was stopped in the beginning of this century and the concentrations slightly increased and the differences between types of stations are smaller

Conclusions (2) Increase of PM10 concentrations at rural stations mainly due to combustion practices of inhabitants in small villages. Hand in hand with increasing prices of oil and natural gas, the people in villages and small towns tend to return back to traditional cool and wood burning

Conclusions (3) The most serious air pollution situation caused by suspended particles is in the Moravian-Silesian region (Ostrava-karviná agglomeration). In addition to transport and local sources of PM significant contribution is made by further emission sources (metallurgy, fuel processing). Regional transfer from Poland (heavily industrialized Katowice region).

Conclusions (4) Certain seasonal course of the ratio between PM2,5 and PM10, that is connected with the seasonal character of several emission sources. Emissions from combustion sources show higher shares of PM2,5 fraction than for instance emissions from agriculture and reemission during dry and windy weather. Consequently, heating in the cold period can cause the higher share of PM2,5. The fraction ratio ranges between 0,69-0,85 in The ratio at the EMEP station Košetice is 0,87.