Monitoring of deposited particles in cultural properties: the influence ofvisitors

Dust deposition has been monitored internally in cultural properties at fou r different locations for up to one year using horizontally mounted glass s lides. The influence of the number of people entering the buildings on inte rnal dust deposition has been examined. The number of people entering a bui lding could be related to the deposition rates near entrances and it was no ted that where there was a large volume of air surrounding the monitoring p oint this effect was not observed. The effect of temperature and relative h umidity on dust deposition were of no significance. It is proposed that cat astrophic events produce a significant contribution to particulate levels. Suggestions have been made for alternative approaches to the technique. (C) 2001 Elsevier Science Ltd. All rights reserved.