Hi Bill,
We don’t have any plans at the moment to integrate Ozone or NO2 sensors. Secondly, the VOC readings are a TVOC (Total VOC). Meaning that the sensors produce one value to reflect all of the VOCs they are detecting.
There also isn’t a clear indication of what specific VOCs are being detected. The component producing VOC readings is the Bosch BME688. You can view its datasheet here: https://www.bosch-sensortec.com/products/environmental-sensors/gas-sensors/bme688/#documents
This document includes information on what gasses are used to calibrate the sensor, but does not provide an exhaustive list of detectable VOCs.
For more information on the capabilities of PurpleAir sensors, go here: What Do PurpleAir Sensors Measure and How Do They Work?