All-In-One Air Quality Monitor w/ Home Assistant Integration

I wanted an air quality sensor that measured everything: PM, RH/T, VOC, NOx and CO2, and integrated nicely with my Home Assistant setup. I came across Sensirion's SEN66 sensor which was perfect for the project. I added a little e-ink display to show the sensor readings and with an emoji that reflects the air quality. Everything is wrapped in a compact 3D printed case with an industrial look.