| Summary: | 11 Abstract In the last decades great attention has been paid to the particulate matter with respect to its effects on human health. However, only recently have studies begun to examine finer PM size fractions. Despite an increasing number of the publications very little has been known about the PM1 size fraction, its concentration, chemical composition and the relationship to the coarse particles.. The present dissertation is aimed at characterisation of the particulate matter indoors and namely chemical composition of its fine size fraction PM1 (particles with the aerodynamic diameter less than 1 μm) in the indoor environment. The sampling of particulate matter was carried out in Prague as a part of an EU-project "Urban Aerosol" EVK4-CT-2000-00018 during three (2 winter and 1 summer) approx. 30 days long campaigns. 24-hour samples of the PM1, PM2,5 a PM10 size fraction indoors and PM2,5 outdoors were collected. The average 24-hour PM10 outdoor concentrations from the nearest station of the Czech air quality monitoring system AIM obtained from the CHMI were used for comparison. PM1 concentrations were found in range from 8,1 µg m-3 (median for winter 2002) to 23 µg m-3 (median for winter 2003). PM1 represented a majority (more than 70%) of PM2,5 concentration and nearly 1/2 of PM10 concentration indoors....
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