This paper presents some of the results of a second-hand tobacco smoke intervention study
carried out in 19 flats in four different buildings. Two of the investigated buildings were nonrenovated
and two others were renovated. The aim of the study was to quantify infiltration of
ultrafine particles from a smoker's flat into a non-smoker's flat. In addition, several tests were
carried out to describe some solutions for reduction of particle concentrations in the smoker's
flat and the non-smoker's flat. The air change rates and the indoor particle concentrations
were measured continuously during the measuring periods. The particle sources (particle
generating activities) were cigarette-burning in the un-occupied buildings and candle-burning
in the occupied buildings. Reductions of the concentration of ultrafine particles using air
cleaning devices were studied. Results showed that the transfer of ultrafine particles was
about 9% when the source flat was located below the receiving flat, whereas the transfer was
1-2% when the source flat was on the same floor as, or above, the receiving flat.
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