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Air Quality
https://www.hackster.io/gerrit-niezen/openairmonitor-494b2c
Water Sensing
https://github.com/Datenschule/wasserdaten
https://publiclab.org/notes/wmacfarl/01-10-2020/building-the-simple-water-sensor-platform
https://www.hackster.io/justinelutz/water-quality-monitor-with-blues-21b462