Formaldehyde sensor

[abth88]

Hello everyone,

I have an Air Q Pro with the dedicated formaldehyde sensor, and I’m curious about its accuracy and specificity. From what I’ve read so far, it’s generally considered to perform well in both regards.

That said, I’ve noticed some unusual activity. For example, when frying food in the kitchen, the formaldehyde sensor sometimes spikes significantly, alongside the TVOC readings. From my understanding, this kind of cooking activity doesn’t typically release an excessive amount of formaldehyde gas. I’ve also seen a similar effect when using hair products or deodorants nearby.

Has anyone with more experience observed something similar, or could shed some light on what might be happening here?

Thanks in advance!

[Merlin [air-Q]]

Hi @abth88 !

What you’re seeing is probably due to cross sensitvities. The formaldehyde sensor is sensitive and accurate, but like all gas sensors it’s not 100% selective. Frying food can release other aldehydes such as acetaldehyde, and sprays or deodorants often contain isopropanol or ethanol. These substances are chemically similar enough that the sensor can respond to them, which explains the short spikes alongside TVOCs.

The key is to focus on the long-term baseline. Brief peaks during cooking or spraying are expected and not a sign of harmful formaldehyde levels. Only if readings stay elevated for hours or days without an obvious source should they be taken as a more serious indication.

Best regards
Merlin