Mold Air Testing in LA & Ventura Counties
Mold air testing — also called spore-trap air sampling — measures what's actually in the air you breathe. It's the most common test we perform because it answers the most common question: "Do I have a mold problem in this house?"
Call (818) 808-7018How Mold Air Testing Works
Our inspector arrives with a calibrated high-volume air pump and a supply of single-use spore-trap cassettes. Each cassette contains a small sticky surface inside. The pump draws air through the cassette at a measured flow rate (typically 15 liters per minute) for a measured time (typically 5 minutes).
Any mold spores in the air get captured on the sticky surface. The cassette is sealed and sent to an AIHA-accredited lab where analysts identify and count the spores under a microscope, broken out by genus (Aspergillus, Penicillium, Cladosporium, Stachybotrys, etc.) and reported as spores per cubic meter of air.
We always take at least one outdoor control sample at your property at the same visit. Your indoor results are then compared to the outdoor baseline — this is the only valid way to interpret airborne mold data. Learn more about this in our guide to testing methods.
When to Choose Air Testing
- ✓ You suspect a mold problem but don't see visible growth.
- ✓ Family members have respiratory symptoms that improve outside the home.
- ✓ You're buying or selling a home and need objective indoor-air data.
- ✓ You've had recent water damage and want to verify post-drying conditions.
- ✓ You need post-remediation clearance testing to confirm a remediation job was done right.
- ✓ You want documented, defensible data for an insurance claim or legal matter.
Frequently Asked Questions
What is mold air testing?
Mold air testing (technically called air sampling) uses a calibrated pump to pull a measured volume of indoor air through a spore-trap cassette. The cassette captures any mold spores in the air, which are then identified and counted at an accredited laboratory.
How is mold air testing different from a surface swab?
Air testing measures what you are breathing — airborne spores that could affect your health. Surface swabs tell you what is growing on one specific spot. We often combine both: air samples for the general picture, surface samples to identify any visible growth.
Why is an outdoor control sample important?
There is always some mold in the air outside. Without an outdoor sample taken at the same time, the indoor numbers mean nothing. Comparing indoor to outdoor is how you determine whether there is an indoor mold source.
How many samples do I need?
For a typical single-family home, 2-3 indoor air samples plus 1 outdoor control is the standard. Larger homes or multi-level properties may need more. We recommend the sample plan during our intake call.
How long does air testing take on-site?
Each air sample takes about 5 minutes to collect. On-site work including inspection, moisture mapping, and multiple air samples typically takes 60-90 minutes.
When is air testing not the right choice?
Air testing may under-detect Stachybotrys (black mold) and other heavy-spored species that do not aerosolize readily. If you have visible growth you specifically want identified as Stachybotrys, direct surface sampling is more reliable.