In a year long study, researchers at Cardiff University split tested a selection of asthma sufferers, with half the group having mould removed from their home, and "the other half having mould removal delayed by 12 months". There was a noticeable "improvement in symptoms and the use of inhalers decreased".

This study once again shows the importance of removing mould from your environment, something that both the Airfrees and Dehumidifiers are specifically made for.