The BME680 is a great sensor to track tVOC levels, but is not selective to specific compounds, and as other sensors working on a similar MOX sensing technology, such devices cannot output an absolute tVOC level. One could derive a tVOC-equivalent estimation based on the sensor's outputs history, but as such these 'equivalent estimations' may slightly vary between use-cases and interpretations.
BSEC outputs will provide a reliable overview of the evolution of tVOC levels over time for indoor air quality monitoring projects. It also offers the flexibility to display the results in a way that best fits your project and customer expectations (e.g. sIAQ, bVOC eq , or even your own algorithm based on compensated gas value or sIAQ).
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