This seems to be the best one for indoor monitoring: https://www2.purpleair.com/products/purpleair-touch API Docs https://community.purpleair.com/t/making-api-calls-with-the-purpleair-api/180 Example API Connectors Located Here: https://github.com/wishonia/FDAi/tree/72a45934262b88bb99bf4f527edd0d014e0e57ac/apps/dfda-1/app/DataSources/Connectors This would be a good opportunity to document how to add a new connector. Please comment if you're interested, and I can help you build it.