Air purifiers come in all sorts of shapes and sizes, from desktop to rooftop, on large buildings and everything in-between.

Each will have different capabilities in terms of what they filter out, but as a general rule, good quality air purifiers will filter out pollutants, allergens, and toxins that might be in the air you breathe.1 Allergens are substances that cause an allergic reaction, including asthma.

Australia has the highest rate of asthma in the world2, and allergic asthma caused by allergens such as pollen, dust (and dust mites), food items, and mould3 is the most common form.4 Then there are the non-allergic asthma triggers caused by things like viruses, air particles from smoke, cleaning products, perfumes, and aerosol products.3

However, with the right types of filters, many of these triggers are removable.

For example, a good quality air purifier will have a filter that extracts dirt, hair, pet fur, dander, and course dust, while a carbon filter might remove odours and volatile pollutants.

According to Choice Australia5, and supported by Asthma Australia6, one of the most important filters is called HEPA because it traps dust, smoke, mould and other particles down to a tiny 0.3 microns in size. To put that into perspective, a human hair is about 75 microns across, and anything below 40 microns is not visible to the eye.7,8

Sophisticated air purifiers will also include photocatalyst and UV (ultraviolet) filters that can remove toxic chemicals and kill a variety of common bacteria and germs respectively.9,10

In the Sydney summer of 2020, the city was shrouded in smoke prompting great concern among health authorities. Small particles called PM2.5 are usually found in smoke and elevated levels can be particularly dangerous.11 Fortunately, HEPA filters can help remove such particles.12

More recently, NSW faced floods, courtesy of La Niña, that left many people with a mould problem.13 Once again, it’s HEPA filters to the rescue.

So, even if nobody in your family suffers from allergic asthma, with climate change, bushfires and floods may become even more frequent. That might be reason enough to invest in a good quality air purifier.

You can check out the range of multifilter air purifiers at Welcare here.