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A nice map with air quality.
PM10 and PM2,5.
People build their own sensor and connect it to the Internet.
Open environmental data 👍
https://sensor.community/en/
@JohanEmpa Have a look at https://opensensemap.org/ for a similar project!
@JohanEmpa sounds great! Although I would love if they had more hackish solutions, like turning an old phone into a noise sensor