Breath of fresh air
Airman 1st Class James Boone, 4th Aeromedical Dental Squadron bioenvironmental technician, notes readings on a quantitative fit test report form from a Porta Count Plus testing system on Seymour Johnson Air Force Base, N.C., Sept. 24, 2009. A Porta Count Plus tallies the number of particulates in the mask against the number of particulates attempting to enter the mask. (U.S. Air Force photo/Senior Airman Ciara Wymbs)
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