Fig. 7From: Indoor/outdoor particulate matter concentrations and microbial load in cultural heritage collectionsSeasonal variation of particle number concentration (particles/cm3) in the Historical Museum of Crete in Heraklion, the Criminology Museum of the University of Athens and the Neophytos Doukas Library in Zagori a outdoors; b indoors; c showcases and d mean particle number concentrationBack to article page