Noise is another factor – you don’t want to replace one irritation (allergies) with another (the sound of a jet plane in your room). For many, the hum is something that doesn’t bother them, but some purifiers can get very noisy. It’s also worth remembering that, while some machines are quiet on their lowest setting (where they’re often at their least effective), they might be loud on the fastest (where they’re working at their best).

As hayfever season hasn’t really started yet, I haven’t been able to fully test the 100% Pollen Neutraliser Technology which pulls in and traps pollen from the air, before neutralizing it. I will look forward to seeing how effective this is later in the year and I will update this post. Using the air purifier’s humidifier function An air-quality sensor, which enables the machine to switch itself on when the air quality becomes poorer, can be useful. After all, you can’t see when the air quality dips, for example, as the result of a high pollen count. What we really like about this purifier, however, is that it’s both effective and pretty quiet about it. At full tilt, it’s as noisy as most rival air purifiers, but in its sleep mode you’d struggle to hear it above ambient sound levels – we measured the output at just 31dBA. In our deodorant spray test, the H-Purifier 500 got the PM2.5 concentration down to safe levels within two minutes and eight seconds, and Hoover’s three-filter purification system has been approved by the Allergy UK charity. We’re not 100% sure about the option to add essential oils to the airflow, but the options include an H-Biotics bottle that adds probiotic “good” bacteria to the atmosphere. All in all, it’s a superior purifier that’s perfect for mid-sized and larger rooms, with a price tag that won’t leave you gasping.The best air purifiers for larger rooms 1. Hoover H-Purifier 500: Best quiet purifier for larger rooms Inside a Hoover air purifier is a HEPA (H13) filter as part of the H-TRIFILTER system, which traps particles up to 0.3 microns in size (for scale, the human eye can only see 25-micron particles). Wi– The HEPA filter traps the harmful particles whilst the active carbon filter traps odours. Perfect for filtering out smoke and cleaning the air in your home. It was around the same time that I was diagnosed with asthma. I had many episodes as a child related to my allergies and my asthma. There were numerous occasions when I ended up in hospital needing treatment and help to breathe. If you suffer from respiratory conditions like asthma or you have young children in the household, you might be particularly concerned. Dr Jo Barnes is Associate Professor of Clean Air at the University of West England’s Air Quality Management Resource Centre. She explains that very fine particulate matter in the air at home can not only damage your lungs, but organs throughout the body.

It’s one of the best-looking air purifiers you can get, but the real attraction is the lifespan of the German-made filters, which can last up to 12 months depending on use. The device reminds you when they’re in need of replacement. Another nice feature is an intelligent auto mode, which senses how much pollution is in the room and chooses appropriately from its five speed settings. We’ve ended up placing it in the hallway of our flat as this is the most central position where every room is no more than two metres away. From this position, the air purifier can easily detect all triggers that may activate the device. There is also uninhibited airflow around the device which enables the 360° Air Flow system and guarantees fast and efficient air purification. If it reaches optimal levels for over 30 minutes then the Hoover H-Purifier 500 switches to stand-by, which helps save energy and avoids the machine running when it doesn't have to. The unit still monitors air quality and will switch on again if it sniffs out any pollutants in the atmosphere. Even without all the smart stuff, this is an easy purifier to use. Clear indicators show the current mode and power setting, while a central ring glows blue through to red, depending on the current air quality readings. You can pretty much leave it on the Automatic setting and let it do its thing. It can get a little noisy at its highest speeds, peaking at 52.7dB in Turbo mode, but we measured a very reasonable 28dB in Sleep mode.While pollen, dust mites and bacteria can all be handled as a given, the active carbon filter promises to filter out more pollutants, such as cigarette smoke, fumes and odours. Depending on who you live with the latter pair might be more useful than you think. We found the Hoover H-Purifier 500 was more than capable of taking on the foul air produced by a Sunday roast-sized portion of Brussels Sprouts, so it’s essentially game for anything. We found the app was great at providing quite a lot of detailed information, and can also deliver forecasts that help improve conditions moving forwards. It is also a little buggy in places though and we’re keen to see how it copes with staying on top of pollen settings come hayfever season. So, if you have smoke in the home regularly or it enters from outside of the home the air purifier can significantly improve the air quality indoors and prevent lung damage which leads to better quality of life, reduced allergens and a better night’s sleep. Which H-PURIFIER is best for smoke?

Neither myself nor my husband smoke so we weren’t able to test whether the air purifier was able to successfully remove the smell of cigarette smoke. Are air purifiers worth it? The Wi-Fi setup is straightforward enough if you’ve ever done the same thing with other wireless-enabled appliances in your home. The unit has three different settings to choose from with an Auto option that essentially removes the need for any real setup as such. This sets the fan speed for you, based on the air quality the appliance has detected. It’s as a purifier that we’re recommending it here. The Purifier Cool Autoreact offers an extremely high level of filtration, with a fully-sealed H13 HEPA system rated to remove 99.95 percent of particles down to 0.1 microns and a carbon filter to remove odours, harmful gases and VOCs (volatile organic compounds – see FAQ section below). At just 18dB on its lowest setting, the Blue 3210 is technically quieter than a whisper. It’s certainly the quietest we tested as well as one of the most efficient, using about as much energy as an LED lightbulb. The CADR rate measures how much air is filtered in cubic metres per hour (m 3ph) of clean, purified air produced. The higher the CADR rating, the cleaner the air in the room will become. As a rule, if the square root of the CADR rating matches the floor area of the room – eg 625m 3ph in a 25m 2 room – it is an excellent air purifier. Three-quarters is good and half is acceptable. You may see CADR measured in cubic feet per hour on American devices, but the maths is the same.The biggest impact is on cardiovascular and respiratory health but there is evidence that air pollution can have widespread effects,” she says. “Exposure to air pollution during pregnancy, for instance, is linked to low birth weights and pre-term births. Particulate matter associated with road traffic has also been found on the placenta.”