Hmmm, just because the schematics for something are available doesn't make it "Open Source". It needs a license which enables people to re-use, rebuild, share and potentially even compete with the original.<p>Just having the schematic available - but with no license - is more akin to "source available" than open source.<p>It's unclear what the license for the Air Gradient hardware is, as only the Terms & Conditions seem to mention anything related to usage, and it's piecemeal:<p><a href="https://www.airgradient.com/terms-conditions/" rel="nofollow">https://www.airgradient.com/terms-conditions/</a><p>Some of the points:<p><pre><code> * Reverse engineering allowed ;) Being open-hardware, we invite makers to extend our
air quality monitors and explicitly allow additions on the hardware as well as the
software.
* Self-repair encouraged!
</code></pre>
While that's better than typical closed source stuff, it doesn't sound like they'd be ok with someone wholesale reusing their design to launch a competing product.