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Dust samples may focus on "old dust" or "recent dust" found in buildings or on building surfaces.
This article defines old building dust, recent building dust, where each type of dust may be found, and why we may want to collect and examine old dust or recent dust in buildings.
The thick dust shown in our page top photo is probably an "old dust" accumulation.
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At DUST SAMPLING PROCEDURE we discuss whether or not one should be testing for problem dust articles at all? So should we be collecting and testing building dust?
Probably not: If the building IAQ question is simply about mold identification, and you already see mold on indoor surfaces, NO mold testing is needed to just to confirm that mold is present in the building and that cleanup is needed
. Sure, it might be just cosmetic mold (seeCOSMETIC MOLD, RECOGNIZE ) but for small mold cleanup jobs testing is not normally appropriate.
Maybe yes: But if you need to identify the contents of dust, for example to help track down possible sources of building dust particles, or to screen for problem particles such as dust mite fecals, insect fragments, animal dander or hair, soot, fiberglass, etc., or if a large mold remediation project is planned, tests may be needed for project control.
Dust sampling theory: usefulness & definitions of "old dust" and "recent dust" in buildings & where these are found
The following description of "old dust" and "recent dust" are my subjective opinion based on experience and are intended to supplement the building settled dust sampling method discussed at MOLD TEST KITS - how to collect settled dust from individual or multiple surfaces using clear adhesive tape as a means to characterize what particles have been in building air over time.
Also see VACUUM CASSETTE FILTER SAMPLE TESTS for DUST / MOLD - collecting settled building dust from one or multiple surfaces using vacuum cassettes.
Definition, Location, & Usefulness of Collecting "old" building dust
Old dust represents particles settling out of building air a time period of weeks, months, years, or dust conditions before, or at the end of a recent demolition, renovation, or cleanup project.
Even after recent cleaning, old building dust can often be found in locations rarely cleaned such as horizontal trim over a door, on window muntins or blinds, under radiators, etc.
An old dust sample is useful to get an idea of the historically dominant particles present in a building and to screen for unusual particles that should not be there. The common dominant particles in most residential buildings are fabric fibers, skin cells, often starch granules (photo above left) and at lower levels, typical airborne mold, dust mite fecals and similar material.
Definition, Location, & Usefulness of Collecting "recent" building dust
While statistically less robust since it represents only a shorter time interval (typically days or weeks), recent dust can serve as a screen to look for evidence that problem particles remain in a building at actionable levels - or not.
Just how much time needs to elapse between building cleaning and the collection of a meaningful sample of recent building dust varies from hours to a month, depending on building materials, contents, occupancy, HVAC systems, cleanliness of adjoining areas and similar factors.
Key is to collect recent dust from a surface that we know (and perhaps confirmed by earlier sampling) was previously cleaned and very low in settled dust particles at the start of the test period.
In this case an old dust sample might find high levels, even dominant levels of vermiculite insulation in building areas near the spill or where HVAC systems transported building dust from the spill to other areas. A recent dust sample should find vermiculite fragments only low levels, perhaps just at incidental levels, and certainly not dominant level.
If you have questions about the best particle sample collection procedure for your situation, Contact Us by email.
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