FWIW, TVOCs can collect together and move around in "waves", your indoor air is not just one big evenly distributed "soup". The sensors also have lots of factor

FWIW, TVOCs can collect together and move around in "waves", your indoor air is not just one big evenly distributed "soup". The sensors also have lots of factors that affect them, such as humidity - you can usually find more info in the docs for the sensor part. A better approach would be to sample consistently and use that to build a graph showing TVOC ppm over time.