Thanks for the answer. @handytech wrote: Below are some more details about the different outputs you listed, hopefully that will help you pick the best solution for your application: Static IAQ: The main difference between IAQ and static IAQ (sIAQ) relies in the scaling factor calculated based on the recent sensor history. The sIAQ output has been optimized for stationary applications (e.g. fixed indoor devices) whereas the IAQ output is ideal for mobile application (e.g. carry-on devices). Ok, it applies to our application. bVOCeq estimate: The breath VOC equivalent output (bVOCeq) estimates the total VOC concentration [ppm] in the environment. It is calculated based on the sIAQ output and derived from lab tests. In the datasheet (BST-BME680-DS001-00 Revision_1.0_072017, p8/50, 1.2 Gas sensor specification), it is written : Besides ethanol (EtOH) as a target test gas, the sensors are also tested with breath-VOC (b-VOC). The b-VOC mixture, as listed in Table 5, represents the most important compounds in an exhaled breath of healthy humans. The values are derived from several publications on breath analysis studies. The composition does not contain species which would chemically react to ensure that the mixture is stable for at least 6 months. Furthermore, the composition is also limited to species which can be manufactured in one mixture. So BVOC is only a mixture of gaz emitted by human. So BVOC value will only be more than one if the mixture of sensors is detected, meaning a human breathing? CO2eq estimate: Estimates a CO2-equivalent (CO2eq) concentration [ppm] in the environment. It is also calculated based on the sIAQ output and derived from VOC measurements and correlation from field studies. Since bVOCeq and CO2eq are based on the sIAQ output, they are expected to perform optimally in stationnary applications where the main source of VOCs in the environment comes from human activity (e.g. in a bedroom). Since fire emits CO2, CO2eq would be very high in case of fire? Thanks,
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