The answer.
ALEX is an indoor air quality monitor in development. It is designed to make changes in your home’s air easier to see and understand. It does not filter, purify or otherwise clean the air.
A little more context.
ALEX is being designed around the rhythms of a home: the people in a room, the time of day and the things happening around them. The aim is to make those changes easier to understand, without asking you to spend the day watching numbers.
Monitoring provides information. Improving the air itself is a separate step, so ALEX should not be confused with an air purifier.