We hope that this short article has helped answer your questions as to how much it costs to run an air purifier. Air purifiers use different kinds of filters to do their job – usually, a large, washable, reusable pre-filter to collect bigger particles, plus a finer filter, which is usually a disposable high-efficiency particulate air (HEPA) filter. The length of time this lasts varies, but on average expect it to need replacing every six months (or fewer if you use the machine less). It’s the HEPA filter that catches all the tiny airborne nasties, and these are capable of catching particles as small as 0.3 microns, which is more than three times smaller than a cigarette smoke particle.

The best air purifiers for larger rooms 1. Hoover H-Purifier 500: Best quiet purifier for larger rooms

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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. It’s extremely easy to set up, just a case of inserting the filters in the base and turning it on. Operation via the remote and the little screen on the unit is straightforward, too. If you’ve never seen a domestic air purifier, this is exactly what you imagined it would be like. We go above and beyond to embrace the future, constantly exploring and inventing to meet the ever-changing demand of our customers and consumers. It may be at the pricier end of the scale, but the AEG AX7 must be the best-looking air purifier on the market. Ideal for living rooms, its five-stage purification system ensures the capture of up to 99.9% of all microscopic particles and bacteria and can clean the air in 60m 2 room in as little as seven minutes, while making no more noise than light rain. The best air purifiers for mid-sized rooms 1. Sharp UA-HD50U-L: Best purifier and humidifier for mid-sized rooms

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.A Swiss manufacturer we’d not come across before, Stadler Form launched their first product, the odd-looking Fred humidifier, in 1998 and now produce high-quality fans, heaters, dehumidifiers and air purifiers. Our favourite is this one, Roger Little (there’s also a Roger Big for 104m 2 rooms and plain old Roger for 66m 2 rooms). Something to look out for when buying an air purifier are ENERGY STAR certified room air purifiers. These air purifiersare over 25% more energy-efficient than standard models, saving consumers about 120 kWh/year 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. 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.” Most people are pleasantly surprised when they invest in a quality air purifier. Because it can improve the air environment for the whole family, remove all kinds of bacteria in the air, prevent people from inhaling them, and make the home life of parents and children better.