What ERMI actually measures
How the Environmental Relative Mouldiness Index scores 36 mould species from one dust sample — and what the number means for your home.
Guide coming soonHelp & Education
Understand mould & your health
Guides and resources from our scientists — what we test for, what the results mean, and how to make sense of your environment. We're environmental assessors: we look at the indoor environment and occupant exposure, with lab testing as part of the picture.
HERTSMI-2 and re-occupancy
Using the 5-species HERTSMI-2 screen to decide whether a remediated building is ready to re-occupy.
Guide coming soonMould and your health
Plain-English background on mould, bacteria and water damage, and why occupant exposure — not just visible growth — is what matters.
Guide coming soonReading your lab report
A walk-through of a NSJ report: scores, species, and the interpretation our scientists add.
Guide coming soonNot sure where to start?
Talk to a scientist — not a salesperson — and we'll point you to the right test or guide.