[snapcaster]

You're lacking in imagination, and maybe the conceptual idea of "sensor fusion". Multiple seemingly innocuous data streams in isolation can be combined to create sensors you wouldn't have imagined

[mynameisvlad]

Do you understand what data is available in a smart air purifier?

Please, explain exactly what sensor fusion would get you actionable data out of the PM2.5 sensor and "gas sensor" in a Philips smart air purifier.

[jamesrr39]

At a guess; if able to monitor over a period of time (e.g. pick up data from a parked car), a potential burglar can see when there is activity and figure what times of the day house occupants are normally at home.

[mynameisvlad]

> that can't be gleamed by just looking through their windows, blinds and all.

I mean, sure, but who is going to do that when they can... look to see when people are home.

[jamesrr39]

More subtle; the burglar could just park up and go off for a few hours and gather the data they need - no need for a suspicious camera pointing out of the car to monitor patterns.

If the burglar only takes a 30 second look before breaking in, residents could be home but away from a window, with this the burglar can more confidently know when is a good time to break in, without exposing themselves to the same risk that looking around the house brings.

[dotancohen]

Maybe increased CO2 on Tuesday afternoons will tip off that the wife is cheating?

It's not even far fetched, smart watches reporting physical actively at unexpected hours have revealed infidelity in the past.