I turned on my new Temtop M10 air quality monitor tonight.
We’ve had our Blueair Blue Pure 211+ air purifier running for several days now, supported by a MERV 13 filter in our furnace (running the fan full-time) and another MERV 13 filter strapped to a box fan running on low speed.
Here are the readings on the Temtop.
PM2.5: 2 μg/m3
TVOC: 0.01 mg/m3
HCHO: 0.01 mg/m3
I’m not an expert in air quality, but those look like decent readings to me considering the wildfires all around us.