CO2 and PM2.5 require different sensors, so buyers need to be very cautious that their model explicitly includes both, and states CO2 as a ppm value. Costs are

CO2 and PM2.5 require different sensors, so buyers need to be very cautious that their model explicitly includes both, and states CO2 as a ppm value. Costs are about $70. They're also available on AliExpress.