Winix Zero Filter A for Air Purifier
A capable multi-stage air purifier with solid filtration, held back mainly by the lack of smart-home features.
Does an Air Purifier Help With Mould? (UK Guide)
Air purifiers are often suggested for mould, but their role is limited and easily misunderstood. Here's what one actually does about mould, and why it isn't the whole answer.
Quick answer
An air purifier with a HEPA filter can capture airborne mould spores, which helps if mould triggers your allergies. But it does not remove mould growing on walls or stop it spreading, because it can't lower the humidity that mould needs. For a mould problem you also need to fix the damp - usually with ventilation and a dehumidifier.
What it helps with
As air passes through a HEPA filter, mould spores floating in the room are trapped, reducing how many you breathe in. If mould makes you sneeze or wheeze, running a purifier in that room can ease symptoms and lower the airborne spore count.
What it can't do
An air purifier doesn't change humidity, so it can't stop mould growing - mould thrives on damp surfaces regardless of how clean the air is. It won't remove mould from walls or grout either. To actually deal with mould you need to clean the existing growth, fix the moisture source, and keep humidity down.
The right combination
Use a dehumidifier or better ventilation to bring humidity below about 60% so mould can't grow, clean off any existing mould, and run the air purifier to capture spores and help with the allergy side. Together they address both the cause (moisture) and the symptom (airborne spores).
Our top picks
#1
#2 
Winix Air Purifier for Home Bedroom
A capable 4-stage air purifier with a CADR of 390 m³/h, capturing 99.999% down to 0.1 microns, held back mainly by the lack of smart-home features.
#3 
Levoit Air Purifier for Bedroom Home
A capable multi-stage air purifier with solid filtration, held back mainly by the lack of smart-home features.
Frequently asked questions
Can an air purifier get rid of mould?
No. It can capture airborne mould spores to ease allergies, but it can't remove mould on surfaces or stop it growing - that needs cleaning and lower humidity, usually via a dehumidifier and ventilation.
Should I use an air purifier or dehumidifier for mould?
A dehumidifier tackles the cause by lowering humidity so mould can't grow. An air purifier only captures airborne spores. For a real mould problem, prioritise the dehumidifier and ventilation, and use a purifier to help with spores.
Does a HEPA filter capture mould spores?
Yes - a true HEPA filter traps mould spores from the air. It reduces how many you breathe in, but doesn't affect mould already growing on surfaces.
Bottom line
Our top pick is the Winix Zero Filter A for Air Purifier (our score 9.6/10) - A capable multi-stage air purifier with solid filtration, held back mainly by the lack of smart-home features..