How to Interpret Air Quality Mold Test Results
Interpreting non-viable air quality testing results using the spore trap method involves subjective analysis and several steps to understand the presence and potential impact of mold spores in the indoor environment.
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A step-by-step guide to help you understand and interpret the results of your air quality mold test
01
Collect your mold test report
Obtain the full report from the laboratory or testing company that conducted the airborne mold test. Ensure it includes details on spore counts, types of mold, and comparison with outdoor air.
02
Check for fungal species that indicate water damage
When interpreting airborne mold results, it's crucial to examine the types of spores often found in damp buildings. These include Stachybotrys (black mold) and Chaetomium, which thrive on wet cellulose materials like paper-backed drywall and cardboard that are capable of producing mycotoxins.
03
Observe Aspergillus / Penicillium type concentration
Aspergillus/Penicillium spores are a primary indicator of excessive moisture and water-damaged building materials, and are often associated with poor indoor air quality. In buildings with moderate to severe mold contamination, airborne spore levels typically range from thousands to tens of thousands per cubic meter, such as 1,500 to 50,000 count/m³ for Aspergillus/Penicillium.
04
Compare indoor and outdoor spore counts
Review the spore counts for both indoor and outdoor samples. Elevated indoor counts compared to outdoor levels may indicate an indoor mold issue. Cladosporium is one of the most common mold types found both indoors and outdoors. Concentrations above 700 spores/m³ may suggest a mold problem, particularly if indoor levels are significantly higher than outdoor levels.
05
Review the total spore count
Look at the total number of spores per cubic meter of air (spores/m³). High counts may indicate a significant mold issue. If indoor levels exceed 1500 – 2000 count/m³ further investigation should be considered. Additionally, assess which spores are the most dominant and identify any that are known to be allergenic or toxigenic.
06
Evaluate Distribution Across Samples
If high spore counts are found in multiple locations within the home, it may indicate widespread contamination. If only one area has high counts, it may point to localized mold growth. Control Areas: Areas not suspected of mold growth should have lower spore counts. High levels in these areas may suggest hidden mold or contamination spread.
07
Consider individual sensitivity
Take into account the health and sensitivity of the occupants. Even lower levels of mold can be problematic for individuals with allergies, asthma or other respiratory conditions.
08
Understand the limitations when testing the air quality for mold
Air testing for mold is not a definitive method for assessing mold growth in a building, as it may miss mold on surfaces or hidden areas. The results can be subjective and may vary between consultants. These findings are not meant to offer medical advice or determine the safety of a space.
