overview blurb: https://blog.attuneiot.com/particulate-matter-sensors
Some commercial options
| vendor | item | notes |
|---|---|---|
| Piera | IPS-7100 | 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 |
| Plantower | PMS5003 | 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 |