https://atmosphere.copernicus.eu/breezometer-information-air-quality-and-pollen
https://publiclab.org/tag/air-quality
https://codethecity.org/hack-weekends/codethecity-15-air-quality "Another looking at how the sensor device design could be changed to use a LoraWAN network, rather than domestic wifi in order to upload the sensor data"
http://kstobbe.dk/2019/01/28/first-sensor-array
https://www.hackster.io/damancuso/indoor-air-quality-monitor-b181e9 (Bosch Sensortec BME680 sensor module)
https://www.captor-project.eu/en/
https://www.hackster.io/114723/canairio-red-ciudadana-para-monitoreo-de-calidad-del-aire-96f79a
https://publiclab.org/notes/kkoerner/09-17-2018/how-to-open-and-clean-a-pms-5003-air-sensor
https://publiclab.org/notes/cfastie/11-28-2018/nano-particle-monitoring
https://publiclab.org/notes/johnb1003/10-24-2018/air-sensor-project
http://aqicn.org/sensor/pms5003-7003
https://forum.micropython.org/viewtopic.php?t=4934
https://github.com/kevinkk525/pms5003_micropython
https://github.com/riverscn/pmsx003
Development and Implementation of a Platform for Public Information on Air Quality, Sensor Measurements, and Citizen Science
https://www.mdpi.com/2073-4433/10/8/445
https://learn.adafruit.com/pm25-air-quality-sensor?view=all#circuitpython-code