by 
The Curious Bag
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Air purifiers are devices that remove pollutants from the air inside your home. If they work properly, they can ease the symptoms of asthma or other air quality related conditions.
Types
Air purifiers come in various types: ozone generators, ionizers, room units and whole-house units. They range in effectiveness and cost.
Ozone as a Purifier
Ozone generator air purifiers claim to remove air contaminants when the ozone molecularly binds itself to the other substance. The problem is that ozone is an air contaminant, so beware of these machines.
Ionizers
Ionizers cause particles to adhere to nearby surfaces, but also emit ozone. Avoid any device that can introduce ozone into your living space.
Room Units
A room air purifier is typically a HEPA filter device. It can be effective for the room in which it is operating, but the replacement filters can be expensive and it won't treat your entire home.
Whole-House Solutions
Central whole-house air purifiers can use HEPA filters or electrostatic technology. They can be very effective, but also expensive to purchase and maintain.
Conclusion
Choose a purifier that won't create more problems than it solves. Weigh your particular need against the cost to purchase and maintain any device.
Source:
Mayo Clinic: Ozone Air Purifiers: Can They Improve Asthma Symptoms?
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