Your air quality sensor calculates the CO2 concentration in the environment. The rate in "ppm" corresponds to the pollution level calculated in the environment. The advanced settings of the sensor allow an immediate synchronization between your TaHoma application (notifications) and your installation (color of the sensor's LED and execution of the scenes). If you want to modify your thresholds on TaHoma App, go to the user screen of your sensor and click on the "Advanced" button and then on the advanced function "CO2 thresholds". This will allow you to set the high threshold, low threshold, and interval. If you wish to return to the default values, click on "Reset Default Thresholds".
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