Hi @OceanAir
As you have noted, the VOC readings are experimental, meaning we’re unsure of what they indicate. Right now, any number of factors, VOC-related or not, could be affecting those values.
It’s important to note that the VOC numbers reported are not based on any public health standard. Rather, they correspond to a scale developed by Bosch, the manufacturer of the VOC board.
There is no current health standard for VOCs, more information is available here: Volatile Organic Compounds' Impact on Indoor Air Quality | US EPA