This might be a good candidate to use the Medellìn LoRa Network

This is system to measure and report the quality of Air in the area. It is capable of reporting PM 2.5 and PM 10 measures and save data in a Database with reports in the web page aire.valenciasanchez.com. It also posts tweets automatically at @aireenvigado

Currently it connects using a WiFi network but having access to a LoRa WAN we could install multiple sensores in different locations to capture more data.