Airthings air management system

[Retrovertigo]

I was watching a repeat of the show where Mat Trim was talking about this, and how it checks the air quality in your house for various "contaminants" ....then after him and Simon Biaggi had done their best to convince you there might be nasties you are breathing in, as if to comfort the viewers, Mat Trim ends with "and it's usually just a case of opening the vents on your windows."

Mmmmmm, so why don't I avoid paying £200+ and just open the vents on my windows then???