Why wouldn't that be useful? People be surprised how poor their air quality generally are inside, unless they already measure it, making it better sounds useful in oh so many ways.
> i know, because of the 15-20 smart things i have only one or two are genuinely useful.
What are those things? I have about 70-80 "smart things" by now, but every single one is genuinely useful, otherwise I wouldn't install them in the first place. Lots of open/closed sensors, soil moisture, temperature+pm2.5 sensors, water taps and so on.
First because it’s the wrong solution to the problem. As I understand it bad air quality in a home is created by specific activities like cooking, vacuuming, or lighting candles/incense/smoking. So you solve the problem by turning on the fan when you cook, opening the windows when you vacuum, and by not using incense or smoking.
Second because you can have a dumb sensor and switch the fan on with your hand when it goes turns orange or red.
> I have about 70-80 "smart things" by now, but every single one is genuinely useful
We have different definitions of genuinely useful. I’m glad you find you setups useful tho - you do you!