Eve Room contains a metal oxide semiconductor based gas sensor that detects gases associated with bad air quality such as alcohols, aldehydes, ketones, organic acids, amines, and aliphatic and aromatic hydrocarbons.  The measured gas concentration is calculated with an algorithm into a CO₂ equivalent which is then displayed as an air quality level in the Eve app.

For more detailed specifications, the data sheet for the VOC sensor can be found here:  http://ams.com/eng/Products/Chemical-Sensors/Gas-Sensors/AS-MLV-P2

For more background information about CO₂ equivalents, please read this white paper: