Application Note

3 Fluke Corporation Indoor air quality monitoring made easy with the Fluke 985 Particle Counter
Interpreting the data
A correct interpretation of the data requires an
understanding of the test area. Is the area resi-
dential or commercial? Is it cleanroom or precision
manufacturing area? Is the cleanroom “at rest” or
“operational”? Is the location exposed to tobacco
smoke or combustible particles? Is there construc-
tion at or near the location? A proper assessment of
the environment can help narrow down the list of
problem particulates.
Concentration limits vary widely according to
the size and type of facility, among other variables.
However, a high-level assessment can provide
direction on whether or not a problem exists. The
following outside air readings provide a high-level
point of reference for the technician:
Scenario 1: The particulate levels displayed in
Figure B are from a new residence (< 5 years),
and do not indicate any concentrations outside of
the norm. In a residential setting, particle levels
are sometimes higher than outside readings due
to more potential particle sources (i.e. pet dander),
smaller diffusion area, and often less sophisticated
filtration.
Scenario 2: The particulate levels displayed in
Figure C are representative of an average office
workspace, and do not indicate any concentrations
outside of the norm. In a commercial setting, par-
ticle levels should be significantly less than outside
readings due to better filtration and better dilution
with outside air.
Scenario 3: The particulate levels in Figure D are
from an older residential location with visible mold.
The readings are significantly higher, and steps
should be taken to remediate the mold and address
the root cause of the problem.
Scenario 4: If the particle source in Scenario 3 is
not visible, use particle size tables such as Table 1
to identify possible sources. Obtain a sample of the
particles and submit to a lab for further analysis.
Figure A.
Figure B.
Figure C.
Figure D.