IoT projects:
ESPEasy 2.0 – binary version releases
SMOG, air quality and purification:
Jack’s project – better graphs for SMOG, and his blog https://consolechars.wordpress.com/
All in one Air Quality project by Jan Szumiec for ESP8266 with different hardware supported
Air purifier – DIY (use Google translate)
Advanced project with ESP8266, smog sensor with heater (enc-X)
http://td-er.nl/ – Projects from Gijs Noorlander
SMOG & Weather stations:
Jacek’s station – https://ppmsensor.sysop.cat/