The Dyson air quality scale
Your app combines data from your purifier's
on-board particle and VOC sensors into a single,
easy to understand air quality value.
Your machine has an optical infrared particle sensor. It
detects particulate matter in the air via reflected light
as it passes through the infrared signal path.
Your purifier is also equipped with a metal oxide
semiconductor sensor. This chemical reacts when
it encounters toxic gases, changing its electrical
resistance which enables detection.