How to choose an air purifier
Purifiers come in various shapes and sizes, remove different kinds of air pollutants in your homes, come with an array of specifications, and offer different features. To help you decide on what purifier to purchase, here are three areas to consider.17 January 2022
1. Intelligent Sensing
Some purifiers offer sensing capabilities and are smart enough to respond by purifying the air automatically when pollutants are detected. To be able to sense, a purifier needs on-board air quality sensors. It should also have software and electronics that will allow it to process that information, and react intelligently to purify the air.
In real life, the only way to truly know how well an air purifier is working is to monitor the air quality. Some machines also come with digital displays that show the live indoor quality, and even the types and concentration levels of particles. This enables the user to understand air quality trends in their homes better.
The latest range of Dyson Purifier Cool range is designed to capture ultrafine dust and allergens, even destroying potentially dangerous VOCs including formaldehyde1. These purifiers have a unique algorithm that diagnoses pollutants at a molecular level from on-product sensors – reacting to purify and display live air quality to the Dyson Link app and the LCD in real time.
Some formaldehyde sensors are gel-based, which can dry out over time, causing the precision and performance of the sensor to deteriorate. Dyson’s formaldehyde sensor is solid-state, and so doesn’t dry out, lasting the lifetime of the machine. Its intelligent algorithm precisely senses formaldehyde levels without confusing it with other VOCs.
2. Capturing: Efficient Filtration
There are multiple methods of filtration in purifiers to consider. Here are four examples.
1. Ultraviolet light uses electromagnetic radiation to destroy bacteria, viruses and mould. However, it does not remove dust, allergens or particles in the air.
2. Activated carbon filters react chemically with pollutants to clear smoke, odours and gases from the air, but alone do not filter out harmful fine particles.
3. Air ionisers work by sending out a stream of charged ions to attract dust and allergens. However, they can produce ozone as a by-product. Ozone is a respiratory irritant, and a component of smog2.
4. HEPA purifiers work by trapping pollutants and fine particles of different sizes. These include pollen, bacteria, mould, dust mite debris and pet dander. They do not however, remove volatile organic compounds such as formaldehyde, benzene or Nitrogen Dioxide. It is also worth noting that not all HEPA filters are created equal. Some are able to capture ultrafine particles, while others do not.