The Dyson Purifier Cool Formaldehyde TP09 is the better air purifier due to its ability to capture formaldehyde and other gases, as well as its built-in Wi-Fi and smart features. However, it is more expensive than the Blueair Blue Pure 211i Max. According to a review by CNET, the Dyson TP09 has a CADR of 350 and can capture 99.97% of particles as small as 0.3 microns.
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