Attached are plots over approximately five days of the dust counts in the H1 PSL enclosure. The plot in the file named particle_counts_h1_psl_recent.pdf started around September 22, 2011. The plot in the file named particle_counts_h1_psl_s6.pdf started around September 22, 2010 (during s6). It appears that the jump in the recent counts may be from turning off the fans: Nic's ilog entry

According the my alog entry, this dust monitor was swapped for a different model on September 13: Patrick's alog entry