AirGradient One Indoor Air Quality Monitor $165 USD ($30 USD OFF) + delivery

One of the best indoor air quality monitors you can get. Also works well with homeassistant.

$30 USD Off BF/Cyber Deal.
Airgradient will also donate another $30 USD for each unit sold to an NGO in need

Sensors for CO2, PM, TVOCs, NOX, Temperature and Humidity

Review here: https://youtu.be/hTJzWlIvUK4?si=VeMV4_g4IrxjnXwv

Won the following Awards:
Most Accurate Multi-Pollutant Indoor Air Quality Monitoring under €500.
– Best Accuracy for PM 2.5 Sensors indoors under €500.
“The AirGradient ONE is a well performing, low-cost multi-pollutant solution for indoor applications. It provides very good to excellent CO2 measurements and good PM measurements. It is an overall well balanced solution and the best multi-pollutant indoor sensor for under €500.”