BLUEAIR DUSTMAGNET 5440i

£399, very.co.uk

BLUEAIR claim their DustMagnet can ‘catch dust before it settles on floors and surfaces’.

The HEPASilent and activated carbon filters are surrounded by a stainless steel mesh that’s electrically charged. This creates a field of static that dust, hair and other larger particles stick to – in a similar way to static electricity generated by friction makes a balloon stick to a jumper.

‘This adds an extra layer of protection,’ says Prof Lewis. ‘Dust comprises of all sorts of things, including human and animal skin, hair, fur and other things people are often allergic to. The less dust, the fewer allergy problems.’

It can change the air in a 355sqft living room nearly five times an hour.

In the deodorant test, the DustMagnet kicked in at full blast immediately and took seven minutes to return the air quality to ‘excellent’ – a little more noisily than the firm’s HealthProtect device but not as loud as its Blue 3210.

The main filters cost £79 and need replacing every six to 12 months, depending on the indoor conditions.