An air ioniser is an alternative type of air purifier. Instead of using a fan or filter to purify the air, as is the case with most air purifiers, an air ioniser does it by electrically charging air molecules.

All models make a bit of noise in use, but some are far louder than others, particularly on the highest setting. The quietest do a very good job both on the lowest and highest setting.An air purifier isn't the first line of defence against indoor air pollution. Ultimately, generating less indoor pollution means you'll be breathing cleaner air. This stylish air purifier is a perfect for those who suffer from asthma, hay fever or allergies. While some air purifiers just provide one stagefiltration, this model features an advanced6 stage air purification system including a HEPA, Carbon and extra PM2.5 filtration technologies to remove all forms of airborne contaminants that can have a negative impact on your health and well-being. Each stage is specifically designed to filter out different types of particles and pollutants, leaving you with nothing but clean, healthy air. It captures everything from dust, pollen, pet dander, mold and even helps reduce the smell of cigarette smoke too! The noise output is comparable to a desk fan in the summer, and we noticed that it cooled the room down a degree or two. A high-efficiency particulate air (HEPA) filter is a type that uses a combination of trapping mechanisms to capture pollutants. These are often made up of a large particle filter, which can be reused and washed, as well as other finer filters, usually including a disposable HEPA filter. Air purifiers can help to relieve the effects of certain allergies caused by airborne particles, such as hay fever — an allergy to pollen — and dust mite allergies, which are caused by microscopic bugs that live inside house dust (gruesome, we know).

Particles are only one aspect of traffic pollution, though. Gases such as NO2 (nitrogen dioxide) are also an issue and can't be trapped by an air purifier's main filter. If you're worried about pollution from a busy road, look for one that also has a carbon filter, as these are designed to trap gases. They can also help with asthma, which can be caused by allergies such as the ones we just mentioned, as well as smoke and pollution in the air. Do air purifiers remove smells? EU standards state that to use the term HEPA a filter must remove at least 99.95% of tiny particles with a diameter of 0.3μm. And for complete peace of mind, it comes with a two-year warranty. What are the different types of air purifiers? If you do want to sleep with your air purifier on, make sure that you look for a whisper-quiet model and have a good eye mask to keep out the light. Do air purifiers help with allergies?

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Enjoyed our recommendations for the best air purifiers? We’ve also rounded up the best air conditioners. Some have a night mode, which reduces the fan speed and dims any lights so that the machine doesn't keep you awake. If you're not planning to run your air purifier in the bedroom, you might not be too worried about this.

We can't specifically test using traffic pollution particles, another concerning pollutant you may be keen to get rid of, but an air purifier that performs well in our dust tests is likely to also do a good job of trapping harmful PM2.5 particles found in traffic pollution, which are a similar size to dust at 2.5 microns (µm).This stylish air purifier is perfect for those who suffer from asthma, hay fever or allergies. While some air purifiers just provide one-stage filtration, this model features an advanced 7 stage air purification system including HEPA, Carbon and extra PM2.5 filtration technologies to remove all forms of airborne contaminants that can have a negative impact on your health and well-being. Each stage is specifically designed to filter out different types of particles and pollutants, leaving you with nothing but clean, healthy air. It captures everything from dust, pollen, pet dander, and mould and even helps reduce the smell of cigarette smoke too! It has a carbon filter that removes smells in the air and it has three fan settings — you'll note it gets noisier as you increase the speeds.