1. 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 29.11-1.12.2006

2. Emise

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

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

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

6. PM10 - annual variation,  g.m -3, 1996-2005

7. PM10 - annual variation,  g.m -3 agglomerations 1996-2005

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

9. PM2,5/ PM10 ratio 2005

10. Poměr Košetice

18. Conclusions (1) Decreasing trend in the period 1996-1999 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

19. 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

20. 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).

21. 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 2005. The 2004-2005 ratio at the EMEP station Košetice is 0,87.