“…The process of abatement, including the size and configuration of the abatement area, work practices, and engineering control methods, has been suggested to be important regarding any observed relationship between area and personal samples [35,63]. Personal work habits, location of negative air filtration, air movement, cleanup, HEPA vacuuming efficiency and frequency, and use of wet methods have been suggested to greatly influence exposure concentrations [19,35,48,51,101,102] and subsequent method comparisons [35]. Since data reported in this investigation are matched, issues of workers leaving the general location, episodic releases, continuous operation of area samples at a fixed location, and related workplace practices are somewhat minimised.…”