Mold Air Sampling

How Mold Air Sampling Works

During air sampling, a calibrated pump draws a measured volume of air through a spore trap cassette over a set period, typically 5 to 10 minutes per sample. The cassette captures airborne particles, including mold spores, on an adhesive slide. The slide is then sent to a laboratory where a analyst identifies and counts the spores under a microscope.

A standard air sampling protocol includes at least one outdoor sample, which serves as a baseline or reference. Indoor samples are compared to the outdoor sample to determine whether indoor spore levels are elevated. If indoor levels are significantly higher than outdoor levels, or if the types of spores differ notably, it may indicate an indoor mold source.

When Air Sampling Is Used

Air sampling is useful when mold growth is suspected but not visible, when a musty odor is present, when evaluating an area after water damage, or when verifying that remediation was effective. It is also used to assess indoor air quality for occupants who have concerns about exposure.

• When mold is suspected but not visible
• When a persistent musty odor is present but no growth is found
• After water damage or a leak to assess airborne spore levels
• After remediation to verify that indoor air has returned to normal
• When occupants have concerns about indoor air quality

Limitations of Air Sampling

Air sampling captures a snapshot of airborne spore levels at a single point in time. Spore levels can vary throughout the day depending on activity, ventilation, and weather conditions. For this reason, air sampling is most useful when combined with a visual inspection and, when appropriate, surface sampling. A single air sample should not be the sole basis for conclusions about a property.

Frequently Asked Questions

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