Don't Buy air purifiers
We reveal the air purifiers that don’t remove pollution effectively from the air.
Our tough independent lab tests help us find the air purifiers that are the best on the market – the ones you can rely on to quickly and effectively remove pollutants, such as dust, smoke and pollen from the air.
But the same tests also uncover the air purifiers that do a pitiful job of extracting polluting particles.
Air purifiers aren’t cheap – they go right up to more than £600. So, make sure you don’t waste your money. We’ll help you to avoid the air purifiers that are a letdown our tests, and instead choose from the air purifiers that clean the air in your home the best.
Which? is independent – we work for you, the consumer, so you can be sure that our product recommendations are influenced only by our test results. We're not influenced by third parties and we don't accept freebies from product manufacturers or retailers. We buy all the products that we test ourselves, so our advice helps you to make the right choice first time and avoid costly mistakes.
What makes a Don’t Buy air purifier?
If you suffer from allergies, or perhaps live beside a busy and congested road, you might want to consider an air purifier to clean the air you’re breathing in your home.
But not all air purifiers are equal when it comes to air purification and their ability to quickly and effectively extract pollutants. Some air purifiers we've tested are so poor they are Don't Buys.
What does a good air purifier look like?
A good air purifier is powerful enough to quickly remove polluting particles from the air in your home, it will be easy to use, it won’t make too much noise when working on full-power and will be almost silent on its lowest setting.
With a wide range of air purifiers to choose from, it might seem tempting to opt for an affordable-looking machine with impressive air-cleaning claims.
But our tests have shown that you need to look beyond manufacturers’ claims to be able to determine which air purifiers deserve space in your home, and which ones are best left on the shop shelf.
Unique air purifier testing by Which?
Which? has reviewed the latest air purifiers from brands, including Blueair, DeLonghi, Dyson, Meaco, Philips and Vax.
See all our air purifier reviews.
Our expert lab assessments are based on six decades of product-testing experience. We examine the features of each air purifier, and test how well each model removes dust, smoke and pollen from the air in our specially built test chamber. We also check how easy each air purifier is to use, including how straightforward it is to remove the all-important filters.
- We test each air purifier’s ability to clean air to an industry-recognised standard.
- We buy every machine we test and our tests cover a wide range of brands and sizes, so you can be sure we’ll always recommend the right air purifier for you.
If we find that an air purifier is bad enough to be a Don’t Buy, you can be sure that it’s one to avoid. No matter how attractive the price may be, it won’t do a good job in your home and is best left in the shop.
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