It's at the bottom of the first link you posted https://www.airgradient.com/open-airgradient/instructions/diy-pro-v42/#license https://www.airgradient.com/open-

It's at the bottom of the first link you posted https://www.airgradient.com/open-airgradient/instructions/diy-pro-v42/#license https://www.airgradient.com/open-airgradient/instructions/di... It's great that you chose to switch to an open source compatible licence.