Page Comparison

https://pierasystems.com/products/piera-7100-intelligent-particle-sensor/

only $100 and unlikely to give the performance we need but does claim to give particle size histogram

https://www.plantower.com/en/products_33/74.html

https://pubs.acs.org/doi/epdf/10.1021/acs.estlett.3c00030 - does better (allegedly) than IPS-7100 at <1 micron

*has been found to not always adhere to manufacturer guarantees

https://www.aqmd.gov/aq-spec/sensordetail/piera-systems---can%C4%81ree-r1

Better coefficient of determination, same manufacturer as IPS-7100 but able to detect at a larger field

https://www.aqmd.gov/aq-spec/sensordetail/purpleair-pa-ii

Best coefficient of determination found so far, used by Forest Service