Other things an air quality monitor might be able to observe

https://commons.wikimedia.org/wiki/File:Airborne-particulate-size-chart.svg

PM10 (particles 2.5 to 10 µm)

Besides wood dust, other things that can show up in this area are: dust, pollen, and mold spores (which range from 3 - 30 µm).

PM2.5 (particles 0.1 to 2.5 µm)

Besides wood dust, other things that can show up in this area are: smoke, ...