Three of the best air purifiers for controlling Asthma

Airfree P40 @ £129.00 - The best choice for small to medium bedrooms

The Airfree P40 is the perfect choice for use in small to medium rooms, especially bedrooms as it is completely silent in use and requires no maintenance or replacement filters ever. Most importantly however, the P40 is independently proven to destroy viruses, bacteria and microorgansims to a higher degree than any other technology - Choose this model if your room is no larger than 40 cubic metres and you do not plan to move the air purifier around on a daily basis. If your room is larger than this, then there are a full range of other Airfree models for different room sizes all the way up to 150m3, see here.

Winix ZeroPro @£269. Best Value for Medium Rooms up to 40m²

Unlike the Airfree units above, the Winix Zero Pro utilises a True Hepa filter to trap the airborne pollutants and allergens. In order to suck these particles up quickly the machine uses a powerful fan motor which gets to work within minutes of turning it on. This means it is a great option if you want to use it in the living room during the day and then perhaps move it to the bedroom at night. The Zero Pro is super quiet and has a specific nighttime mode which makes it virtually silent for night time use. Also consider the BlueMax 3350i and Blueair Classic 205

Airgle AG600 @ £2300 - The discerning choice for larger rooms or offices.

Granted, the Airgle Range of air purifiers cost substantially more than most. However, this is not without good reason.These are officially certified medical devices which trap airborne pollutants up to 100 times smaller than those trapped by regular Hepa filters. Top that with the steel body and medically sealed MERV19 Hepa filter and in all probability you get the most effective air purifiers in the world. Choose the AG600 for medium sized rooms or the AG900 for larger rooms and offices. There is also a fabulous portable version, the AG300 which is ideal for smaller rooms.

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