I have 5 of the Plantower PMS5003. It's what PurpleAir uses (2x) too.

I used one on an arduino to measure the 2020 Bear Creek fire PM / AQI measurements in Paradise CA. PM 2.5 and 10 were pushing 900+.

Inside, with 2 3M Filtrete 2900 filters with the fan on constantly and a BlueAir 680 the AQI was about 5.