(1) Safecast (unfortunately motivated by disaster, but most environmental monitoring spikes after such events): https://blog.safecast.org/ . (2) EnviroDIY (water quality and quantity related; believe they are developing data portal): https://www.envirodiy.org/ . (3) Wunderground has citizen network of weather stations. Not completely open, but they (proprietary company) update forecasts more often than gov't agencies due to automated data collection. The first example has been examined by peer-review ( http://iopscience.iop.org/arti... ). While absolute values are questionable with in situ sensors, the deltas with a large user base (and preferably different sensor manufacturers) would at least cause the academic community to raise their eyebrows.
Slashdot Mirror
(1) Safecast (unfortunately motivated by disaster, but most environmental monitoring spikes after such events): https://blog.safecast.org/ . (2) EnviroDIY (water quality and quantity related; believe they are developing data portal): https://www.envirodiy.org/ . (3) Wunderground has citizen network of weather stations. Not completely open, but they (proprietary company) update forecasts more often than gov't agencies due to automated data collection. The first example has been examined by peer-review ( http://iopscience.iop.org/arti... ). While absolute values are questionable with in situ sensors, the deltas with a large user base (and preferably different sensor manufacturers) would at least cause the academic community to raise their eyebrows.