Here are the particle counts from in side of BSC3 (in the same usual spot near the floor where we have been measuring for the last ~week).
After ~20mins of 1 guy in chamber:
0.3um 100
0.5um 40
1.0um 10
2 people in chamber, but counts taken just after 1 had walked around down in bottom floor of chamber and crawled up under the ACB:
0.3um 1160
0.5um 780
1.0um 340
~45 mins later while doing more baffle work, less walking on chamber floor:
0.3um 398
0.5um 284
1.0um 99
As per note in https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=12488 at next opportunity i.e. when optic can be protected by lens cap the floor (of the chamber) and the flooring should be wiped and vacuumed. Jeff Bartlett has this on his to do list.