I have attached the trends for the .5 micron particle counts per cubic foot from March 31 2011, 22:00-23:00 UTC, the approximate time that Gerardo said he was running the auto-scrubber.

Location 4 is outside the clean room around HAM 12.
Location 5 is in the beer garden.
Location 7 is the former location of the H2 electronic racks.
Location 8 is near the H1 electronic racks.
Location 9 is near the former location of the H2 PSL

I do not see counts as high at location 5 as when the degrouting was taking place earlier this week. I have attached a trend for the last four days for comparison.