If you're an asthma sufferer or someone who's prone to the sneezies - especially during change of season - investing in an air purifier may not be the worst idea.

"Air purifiers improve air quality of certain areas by removing pollutants and allergens, and pushing filtered air back into the space," says  Appliances Online category expert Colin Jones.

Able to remove second-hand smoke from tobacco, bushfire smoke, dust and pollen from the air, air purifiers help you to breathe more easily - and have been proven to reduce the risk of health issues like nasal congestion, sinus headaches, watery eyes and sneezing.

"Air purifiers work by constantly cycling the air around them, removing pollutants and allergens, filtered air is then pushed back into the room," expert Jones explains, "this process is repeated, making the air cleaner with each pass".

"There are various different types of air purifiers and most use HEPA filters, which remove particles such as pollen, dust and smoke. These air purifiers use an extremely fine HEPA filter system removing up to 99.97 per cent of bacteria."

"Air purifiers are portable and easy to be moved to different areas in your home, it is best to keep an air purifier in the room you use the most," Jones say.

"The best place to put an air purifier is where you are getting the most amount of air flow - perhaps near a window or doorway. It is also best to keep an air purifier slightly raised off the ground for better movement of airflow - rather keeping it on the floor."

So that you can breathe better and improve the air quality of your home, we've rounded up some of the best air purifiers currently on the market - with allergies, affordability and smart technology in mind.

Winix Zero+ Pro 5 stage air purifier, $614, Appliances Online

Breathe easy with this Winix air purifier that uses a five-stage filtration system and is equipped with a Aussie hospital-grade HEPA filter, deodorisation technology, four fan speeds and a triple smart sensor. Plus, with a two-year warranty, you hayfever and asthma sufferers can feel at ease making this investment.

"It’s burn-off season and I can’t smell smoke in my bedroom at all," said one five-star reviewer, "and am having less issues with asthma overnight - it  was easy to set up, and it automatically adjusts".

Honeywell True HEPA allergen remover, $1003.13, Amazon

Featuring timer options, four cleaning levels, turbo mode, and a control panel dimmer for nighttime, this Honeywell air purifier is especially good at removing pet dander, dust and pollen from the air. Also helping to reduce airborne germs like viruses, bacteria and mould spores with the true HEPA filter, this model is a welcome addition in any room.

"We have two dogs and my wife that has allergies with dust. This air purifier has eliminated all dog smell and my wife has not been congested or has had issues with her allergies. Also for noise levels, it is very quiet and hasn’t bothered our sleep at all," wrote a reviewer who left five stars.

Samsung Versatile AX60 air purifier with wifi, $799, Bing Lee

Ideal for medium and large rooms up to 60m2, this Samsung air purifier is true to its name 'Versatile' - being on wheels means it can move room to room easily. This model also features 3-way airflow, an air quality indicator, smart control, a child lock and a whisper-quiet sleep mode.

"With a house full of allergy sufferers, it was time to see what the market had to help them manage this," wrote one five star reviewer, "p urchased this little beauty a week ago and not disappointed with the results - very noticeable and welcomed decrease in sneezing and watery eyes."

Philips 3000I Series air purifier, $649, Bing Lee

Featuring voice control, smart filter and sensors, four speeds (including Allergy Sleep mode) and more, the Philips 3000i efficiently removes 99.9 per cent of pollen allergen and virus pollutants from the air in areas up to 135m2. Plus, with energy-efficient design, this model runs at a max 55W - the equivalent of a humble light bulb!

"The air becomes much fresher and cleans rooms very quickly," a five-star reviewer wrote, "it is also very easy to set up with the instruction manual and easy to understand, the instructions are simple and clear".

Breville Smart Air Plus Connect purifier, $599, Appliances Online

Reccomended for large rooms up to 80m2, this Breville model uses a four-stage purification system with a 360 degree immersive airflow design. Also featuring a timer, quiet mode, live purity indicator and a compatible mobile app, clean air is in easy reach.

"The sensor is great and sensitive to any dust and particles in the air. I use it before sleeping and it has helped my allergies. Definitely sneezing a lot less and sleeping better as a result. The app is super convenient too. I like that I can scheduled it turn on at the same time every night," a five-star reviewer wrote.

Lenoxx AP20 air purifier, $95, Catch.com.au

An affordable but mighty option, the Lenoxx AP20 features four fan speeds, timer functionality, sleep mode and a HEPA filter to aptly purify the air in your room or office.

"Easy to move from room to room, makes the room just feel fresher and more inviting, honestly," wrote a five-star reviewer.

Dyson Pure Cool purifying tower fan, $799, Myer

A double threat, this Dyson purifying fan combines an activated carbon filter with a glass HEPA filter to not only purify the surrounding air - but to cool you come the summer months.

"Absolutely not missing the musty smell in the lounge room," wrote a reviewer who left five stars, "the air purifier and cooler is a must in our house".

Appliances Online expert Jones says that air purifiers are great for people with breathing issues to use while sleeping as they help to promote better air quality in the home. Many models now also feature 'sleep mode' which allows for quiet usage during the night.

"Air purifiers are relatively inexpensive to run," Jones says, "running a unit for a minimum of 12 hours a day would help to keep the air quality of your home clean".

"During seasonal times, you may want to increase or decrease this amount - for instance during spring when pollen levels rise, you may want to consider leaving your air purifier on throughout the whole day."

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