You don’t need Dyson’s $649 Pure Cryptomic air purifier to get formaldehyde out of your house

Dyson’s latest air purifier, the Pure Cryptomic, can eliminate formaldehyde that’s floating around in your home. It’s the main selling point that distinguishes this model from the presently-available Pure Cool and Pure Hot + Cool, which can only capture formaldehyde, not destroy it. But before you drop $649 on a formaldehyde-fighting device there are a few things that you should know.

First, it is almost guaranteed that there is formaldehyde in your home. Formaldehyde is just about everywhere. It’s a chemical that’s found in your body, in the environment, and in furniture and wood products. People tend to hear about it in conjunction with health problems, and it’s true — when there’s enough of it in the air, formaldehyde can irritate...

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