3M's HVAC air filter tells you when it needs replacing
As people get more concerned about the air that they're breathing, so the case for buying a smart air purifier becomes more pressing. That's what has prompted 3M to build the Filtrete Bluetooth-enabled residential air filter that can let you know when it's time for a change. The idea being that the filter itself can alert you — via an app for your smartphone — when it's time to run to the store and buy a $30-ish replacement. The filter itself is available in a variety of shapes and sizes, but with a wee bump nestled on the front, which houses the Bluetooth radio and sensors. The system doesn't just act as a prompt for spending more money, and can also offer up real-time data on the air that you're breathing. At least, that's something you can do so long as you spend more cash on a compatible air quality monitor, although that's likely to come with its own app. The platform can also offer up helpful hints on how better to improve your indoor air qual...