[SECProto]

> how much can you buy one for or build one for?

$10: https://www.ikea.com/us/en/p/vindriktning-air-quality-sensor...

presumably not quite feature-comparable, but the article and website are rather absent in report what exactly the "flatburn" is detecting - sounds like "fine particulate" (PM2.5? PM10?) and NO2

[henearkr]

There is no NO2 sensor in the BOM.

[ClumsyPilot]

This is like comparing apples and Orangutans

they are that different