We maintain an open source, open hardware air quality monitor project that is quite popular. We also sell these monitors as easy to assemble kits.
One of the monitors is an outdoor monitor similar to the Purple Air that uses dual PM sensors for enhanced accuracy. You can find more information of the kits here [1] and the built instructions including files for schematics, enclosure here [2].
One of the monitors is an outdoor monitor similar to the Purple Air that uses dual PM sensors for enhanced accuracy. You can find more information of the kits here [1] and the built instructions including files for schematics, enclosure here [2].
[1] https://www.airgradient.com/open-airgradient/kits/
[2] https://www.airgradient.com/open-airgradient/instructions/di...