Deposition of fine and ultrafine particles on indoor surface materials

The aim of this study was the experimental determination of particle deposition for both different particle size fractions and different indoor surface materials. The selected surface materials were glass, gypsum board, carpet, and curtain. These materials were tested vertically in a full-scale test chamber. Experiments took place in a 32 m(3) chamber with walls and ceiling made of glass. Prior to each experiment the chamber was flushed with outdoor air to reach an initial particle concentration typical of indoor air in buildings with natural ventilation. The decay of particle concentrations was monitored. Seven particle size fractions were studied. These comprised ultrafine and fine particles. Deposition was higher on carpet and curtain than on glass and gypsum board. Particles ranging from 0.3 to 0.5 mu m had the lowest deposition. This fraction also has the highest penetration into buildings and its indoor concentration is expected to be closest to outdoor concentrations.