Does the TP09 really remove formaldehyde?

Yes. A sensor detects it and a catalytic layer breaks it down into water and CO2 continuously, so it is not just stored in the filter.

How large a room can it clean?

Dyson rates it for about 101 sq ft. That fits a bedroom or small living room; larger spaces need more than one unit or a bigger purifier.

Yes. It connects over Wi-Fi and Bluetooth and works with the Dyson app, Alexa, Google Assistant and Siri.

Up to about 60 dB, roughly normal conversation level. Most owners run it lower at night.

The purifier, a combined HEPA and carbon filter, and a remote control. A power supply is included.

The TP09 adds the formaldehyde sensor and catalytic destruction layer. The TP07 filters particles and gases but does not break down formaldehyde.

At Staples, for $696.99, as of our latest check.

Rated 4.1 out of 5 from 37 ratings.

3 stores we checked sell it, including Staples, Dyson, Quill.

$696.99at StaplesChecked 10 h ago

Compared across 3 stores. Prices are checked against each store and labelled with when. Store links may earn us a commission. Price via Klarna.

It checks today's price at every store, compares the alternatives and answers in about a minute.