The studies on the chemical composition of particulate matter PM10 constituted a part of the research project carried out at the Department of Meteorology and Climatology of the WULS in Warsaw. Particulate matter samples for analysis were collected at the MzWarszSGGW air quality monitoring station where PM10 concentration was also measured (the mean daily concentrations were considered in this study). From those, 34 samples were randomly selected for qualitative analysis. The levels of chosen elements were determined at the Warsaw Institute for Environmental Protection, by employing microwave solution in HNO3 + HCLO4 and PN-ICP-AES(A) measurements. The data on the mean daily concentrations of heavy metals in PM10 (measurements PN-ICP-AES(A) and (AAS), obtained at the station MzWarszBernWoda and provided by WIOŚ in Warsaw, were used for comparison. The values of heavy metal concentration in the Warsaw conurbation were referred to the target values specified in the Directive 2004/107/EC. It was found that the concentrations of arsenic, cadmium and nickel in the PM10 fraction at the stations MzWarszBernWoda and MzWarszSGGW in the years 2005 and 2006 remained at a low level and did not exceed the target values. For the MzWarszSGGW station, the mean concentrations of these elements ranged from 16 to 22.6% of the allowable limit, however, the maximum daily concentrations of arsenic and cadmium accounted for 120.1 and 126%, respectively, of the yearly limit proposed in the Directive.

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