Resources
Understand the question before choosing the test.
Use these homeowner resources to compare environmental evidence, understand report limits, and choose a practical next step.
Explore by need
Start with the decision in front of you.
Compare environmental tests
Compare tests by sample type, question answered, limitations, and current availability. Available tests show current pricing and ordering options.
Explore DIY tests →Understand reports you have
Learn what an Environmental Review includes and how professional review turns multiple records into clear next steps.
Explore Environmental Review →Talk through the situation
Describe what happened in plain language. MEL may identify testing, existing-report review, source investigation, a qualified professional, or no additional testing yet.
Ask MEL →Four evidence domains
Environmental findings are not interchangeable.
Each domain contributes a different part of the picture. Matching the domain to the question helps prevent unnecessary testing and unsupported conclusions.
A defined place and sampling period
What was present in sampled air during the collection period.
What accumulated
What has accumulated in settled dust over time.
The exact item or material sampled
What was found on a specific sampled surface, material, or object.
What is happening in the building
Inspection or investigation can help identify moisture, damage, affected materials, and possible source conditions.
Learning center
Understand your results and testing options
Five homeowner-friendly guides. Start with the question you need answered, not a test name.
ERMI vs. HERTSMI-2: What Is the Difference?
Compare targets, scoring, accumulated dust evidence and limitations.
Read guide →Can You Test Indoor Air for Mycotoxins?
How a defined room-air sample can help evaluate potential inhalation exposure—and what detection cannot prove.
Read guide →How to Interpret an ERMI Score
Look at species, sampling and moisture history rather than the score alone.
Read guide →What Testing Makes Sense After Mold Remediation?
Match follow-up evidence to the work and the original concern.
Read guide →Why Two Environmental Reports May Disagree
Understand differences in method, place, time and reporting limits.
Read guide →Educational materials only. Environmental measurements relate to the specific test, location, sample and time. They do not determine individual dose or medical causation.