Since last weekend there is a solar/akku powered particle sensor with a loarawan/ttn data connection working on the luftdaten.info map. The hardware is a mix from the workshop from Frank (https://www.thethingsnetwork.org/labs/story/workshop-creating-a-ttn-node) and the original luftdaten.info sensor (http://luftdaten.info/feinstaubsensor-bauen/). The software is pretty primitiv as well, sleeping for 10 minutes, spinning up the fan, getting some readings, sending them and going to sleep again (cycle is around 12 minutes total). The data is then processed in Node-RED and transfered via the REST api to the map.
You can find the hardwarelist, code, Node-RED integration, etc. in my github: https://github.com/Freie-Netzwerker/TTN-Node-particulate_matter
Hardware stuff, arduino pro mini, sds011 sensor, am2302 sensor, loratracker pcb, rfm95w, pololu 5v stepup, adafruit solar controler, 6.660mAh akku, solar panel 6V/2W.
Cheapest possible case…
Solar panel attached.