# Air Quality / CO2: what is it exactly and which sensor to buy **URL:** \ **Category:** Devices\ **Created:** [February 22, 2021, 8:31am UTC](https://community.homey.app/t/air-quality-co2-what-is-it-exactly-and-which-sensor-to-buy/43452 "2021-02-22T08:31:47Z")\ **Posts on this page:** 1\ **Showing post:** 15
**Author:** ![Gruijter](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/gruijter/32/1973_2.png) [@Gruijter](https://community.homey.app/u/Gruijter)\ **Post date:** [October 13, 2021, 7:06pm UTC](https://community.homey.app/t/air-quality-co2-what-is-it-exactly-and-which-sensor-to-buy/43452/15 "2021-10-13T19:06:47Z")
Just wanted to let you all know of a new app I published a few days ago. It supports the airQ device. Not a cheap device, but it has many built in air quality sensors, including a real CO2 sensor. A lot of other devices use some other sensor to approximate CO2. > [@\[APP\]\[PRO\] airQ advanced indoor Air Quality meter](https://community.homey.app/t/52938): > > airQ airQ provides advanced indoor air quality data Supported sensor data (depending on the airQ version): Temperature Humidity % Humidity absolute Air pressure Noise Noise Maximum tVOC SO2 CO NO2 O3 O2 CO2 PM1 PM2.5 PM10 Furthermore the following information is supported: Health index Performance index Virus Free index Dew point Health alarm Virus alarm Performance alarm Fire alarm Gas alarm The following controls are possible from Homey: Sound beeper with duration,… --- _[View the full topic](https://community.homey.app/t/air-quality-co2-what-is-it-exactly-and-which-sensor-to-buy/43452)._