Back in March I investigated the science behind the air purifier.  You can find our past post here: The Truth About Air Purifiers.  While I maintain my position regarding the effectiveness of these devices, they can have some benefit.  Every year new air purifiers are released from a variety of manufacturers.  It can be overwhelming to evaluate the plethora of options, but there are some key things to look for.

Clean Air Delivery Rate

The Clean Air Delivery Rate (CADR) is the most important quality of a purifier.  This is measured in cubic feet per minute, and tells you how much air has been cleaned in a given amount of time.  To put it simply, the bigger the CADR the better the purifier.  CADR is typically given three times for a purification unit.  There is a CADR for pollen, dust, and smoke.

High Efficiency Particulate Arrestance

Also known as HEPA, high efficiency particulate arrestance is the other thing to look for in a purifier.  Filters must meet established standards to be labeled HEPA.  When looking in 2017, a “True HEPA” filter is key for purchasing a quality unit.  A HEPA filter is capable of capturing 99% of the particles that are 2 microns or more in size.  A true HEPA filter captures >99% of particles 0.3 microns in size.  This does not sound like a huge difference, but these particles are very small; meaning this is a big deal.

Which Purifier Should You Buy?

Although this information narrows down the field, there are many similar purifiers out there.  Fortunately there are websites doing thorough evaluations of new products. has done a fantastic review of 2017’s best air purifiers.  I have also provided links below to the purifiers they evaluate.

Are you shopping for an air purifier?  What are your thoughts on their merits, or lack thereof, as household devices?  Please share your thoughts in the comments and connect with us on social media. Also be sure to check out for great product reviews.

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