i am also a "fan" of the home-made air purifier. we had a bunch of them around our house over the fire season this summer. it's helpful to compare the numbers:

i am also a "fan" of the home-made air purifier. we had a bunch of them around our house over the fire season this summer. it's helpful to compare the numbers: https://igor.moomers.org/minimal-viable-air-quality https://igor.moomers.org/minimal-viable-air-quality if you want to build your own monitor, i still have a bunch of PMS7003 sensors around. ping me if you want to grab one in berkeley