A Mold Specialist
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We offer comprehensive written reports for all Mold Test,
which will identify the type of mold present, the amount of
mold, and a detailed recommendation for removing or
preventing any Toxic Mold.

  • We can do Wall Checks to determine if there is Hidden
    Mold behind walls.

  • We offer Mold Inspections for residential or commercial
    properties.

  • We are Certified Mold Inspectors serving all of Los
    Angeles County and surrounding areas.

  • We can Air Test where you live or work to determine the
    levels of mold in the air, and if those levels are safe.

  • We offer Surface and Viable Sampling to determine if the
    surface contains unsafe levels of mold.

  • We offer a quick turnaround time for all tests with same
    day results available.

Areas of Service: Los Angeles County Mold
Inspector, Mold Inspection Los Angeles County,
Mold Testing and Mold Inspections in Los Angeles
County California, Mold Abatement Los Angeles,
Mold Certified Inspection, Mold clearance testing
Santa Monica. A Mold Specialist is the most
experienced mold inspection company in Los
Angeles County specializing exclusively in mold
inspections and mold testing in residential and
commercial properties. Call a Mold Specialist today
and speak with one of our certified inspectors.
Mold is a natural living organism in our
environment. It exists in the air in the form
microscopic spores that move in and out of
buildings through doors, windows, vents, HVAC
systems and anywhere else that air enters. If you
suspect you have a mold problem, it is always best
to have a certified mold inspector assess the over-
all condition and make the appropriate
recommendations for correction. Los Angeles
County Mold Inspector Mold Inspection Los
Angeles County Mold Testing and Mold
Inspections in Los Angeles County California Mold
Abatement Los Angeles Mold Certified Inspection.
Introduction to mold testing and sampling
An IAQ or "mold investigator" cannot reliably identify a mold
genera or species growing on a Building surface by the naked
eye. Despite the recent public fear created by media attention,
including a now-refuted "Toxic black mold" Stachybotrys
chartarum study involving infant illness and death, it is simply
not the case that "black mold" in Buildings is necessarily a
danger to occupants. In fact, having investigated many
Buildings quite carefully, I assert that in most cases the "black
mold" that you see in Buildings is most often an "indicator
organism" telling you that conditions are right for mold
formation. we have often found more problematic molds in
such properties, such as species of Aspergillus sp. or
Penicillium sp. which are airborne, travel in the Building, and
are more likely to be bothering the occupants than a large,
sticky, non-easily-airborne spore like S. chartarum. These
harder to see, often light-colored molds, are quite often
missed entirely by inexpert owners and amateur "mold
inspectors" who go on to collect, over-report the occurrence
of, and react to the "black stuff." One result has been
unnecessary expense for "mold testing" and in some cases
unnecessary mold remediation. Some of our articles, as well
as writing by others who study this field, address these
problems and offer help in deciding what level of trouble and
expense are appropriate.

Trained in Building science, we perform on-site Building
investigations to evaluate the need for and extent of mold
remediation in Buildings in order to give mold remediation and
prevention advice. Also trained in mold and other particle
identification (forensic microscopy), we operate our own
aerobiology laboratory where samples, collected during an
investigation, are examined. In the course of our field surveys
we often collect multiple samples even at the same surface or
Building area, in order to study the relative effectiveness and
consistency of the various methods, just as we test and
compare other tools used to find hidden moisture and similar
problems. (These extra samples, collected for purposes of
scientific study, are not billed to our client.) our opinions about
the usefulness of various methods derive from both study by
other experts and by our own ongoing field and laboratory
testing. Does everyone need to hire an "expert" like us to
examine their home? Of course not. This article offers help in
choosing mold sampling and testing methods and devices.


A Description & Critique of Contemporary Indoor Mold
Sampling/Collection/Testing Methods
Air samples to "test" for mold
A collection device, slide, cassette, or tape are used
with a calibrated air pump to collect airborne particles.
we are not referring to culture plates which rely on
passive collection or settlement of particles as these
have even worse inaccuracies and errors than the
reservations I describe about active air sampling
described here. Some common examples of air
samplers include:

Impaction samplers (Burkard™, Allergenco™) collect
airborne particles through a venturi-slit onto a prepared
microscope slide using a equipment incorporating a
calibrated air pump and a static or moveable slide
permitting single-use or time-lapse sampling.
Cassette samplers (Air-o-Cell™) use a patented 37mm
cassette connected to a calibrated pump (typically at
15 lpm). The cassette is used to collect airborne
particles through a venturi-slit onto a proprietary media
on a cover-slip which is in turn mounted onto a
microscope slide in the laboratory.
Cassette samplers using an MCE filter cassette
connected to a calibrated pump. The filter can be
cleared and examined microscopically (qualitatively,
counting is tough except with the Bi-Air™), or used to
prepare a culture, or both.
Cassette-like samplers use a calibrated pump
connected to a patented stainless steel venturi-device
which accepts a microscope slide prepared with a
collection media.
Anderson-type samplers which collect particles directly
onto a culture dish - for "viable sampling" to "test" for
mold. Culture samples may be useful in some cases to
better identify or to speciate mold which has already
been found in a large reservoir. Otherwise it has
limitations we discuss elsewhere in this document.
Anderson-type impaction samplers which collect
particles on tape wrapped around on a drum or
Rotorod samplers which collect particles on glass rods
are used for outdoor pollen and spore counting and
reporting in the IAAA allergy network. They are not well-
suited for indoor Building assessment though some
folks use the high-error rotorod sampler indoors.
Shortcomings of air sampling for mold - some specifics
But as a "mold test" for the presence or absence of a
mold problem in a Building, a negative air sample
result is of little confidence. As a measure of "mold
exposure" quantitative analysis (spores/cubic meter) is
invalid unless long-term time-weighted average
measurements are made under all varying Building
conditions. While this is an important diagnostic tool,
and one which we apply regularly, it cannot be relied
alone on in the way some investigators would use it:
dashing into a Building and grabbing an air sample.

Air sampling as a "pass/fail" or "present/absent" test for
mold in Buildings is unreliable as a "mold test." Many
variables cause a wide range of particle levels in air
over short intervals. However this method has a place
in a thoughtful Building investigation: air sampling can
be useful as a background check for the possibility that
there is a large reservoir source which has not yet been
found in a Building. But a negative result is of
absolutely no confidence, and quantitative work
(spores/cubic meter) is invalid unless long-term time-
weighted average measurements are made under all
varying Building conditions. our own time-lapse
sampling proves that particle levels vary by a factor of
10,000 due to common variations in Building conditions
such as fan on off, human activity, mechanical
disturbance of moldy stuff, etc. While this is an
important tool it cannot be relied on in the way most
"inspectors" would use it, dashing into a Building and
grabbing an air sample. See "Quantitative Analysis"
comments below for an elaboration or see Mold
Testing: Air samples and their interpretation - a quick
tutorial.inspect-ny.com/sickhouse/tutorial.htm

Spores are collected but not spore producing
conidiophores, hyphae and other components are
collected, making identification incomplete and more
difficult than with tape or cultured samples.
Spores are desiccated and may be damaged by the
collection method, interfering with culture efforts if this
follow-up step is needed.
In sum, air sampling is useful as a background screen
for the possibility that there is a large reservoir source
which has not yet been found in a Building, and may
be useful to compare relative particle levels between a
problem area and a control area, or in an area before
and after cleaning. Independent from spore counts, a
qualitative analysis of an air sample by an expert
technician can provide compelling evidence of a nearby
problem mold reservoir in certain cases, for example if
the indoor sample contains long chains of Penicillium
or Aspergillus spores. These spore chains are so
fragile that they break apart quickly while traveling
through the air. So spore chains found in (a pre-
remediation) indoor sample, even if the total count is
low, deserve some further thinking and investigation.
Toxic Mold