What is spore trap analysis and when is it used?

Spore trap analysis is a laboratory method used to assess airborne mould levels. It involves collecting air samples onto a special cassette, which traps microscopic particles—like mould spores—and then analysing them under a microscope.

In simple terms, it helps identify what types of mould are present in the air and in what concentration. This is useful because mould isn’t always visible, and air sampling can reveal hidden issues that surface inspections might miss.

It’s typically used in indoor air quality (IAQ) investigations—especially when there are concerns about damp, musty odours, or occupant health symptoms. It can also be used to compare indoor and outdoor air, which helps determine whether a building is contributing to elevated mould levels.

That said, results always need context. A high spore count doesn’t automatically mean there’s a serious issue—it depends on the types of mould and the environment. So, interpretation is just as important as the analysis itself.