One important thing to consider is the amount of ozone an Air Purifiers produces as too much ozone can irritate the lungs - an air purifier that produces less than 50 parts per billion ozone is plenty safe enough. Of course you don’t get this issue with the HEPA system as it’s a filter rather than a purifier. The MERV (Minimum Efficiency Reporting Value) Rating is a standard used by most air purifier companies to measure the efficiency of their air purifiers. It is an industry standard among air purifier companies so you can safely use this rating to compare different brands of air purifiers. More on Honeywell Air Purifier.

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