This is one smart device that every urban home could use – TechCrunch

Living in a dense urban environment brings many startup-fuelled conveniences, be it near instant delivery of food -- or pretty much whatever else you fancy -- to a whole range of wheels that can be hopped on (or into) to whisk you around at the tap of an app. But the biggest problem afflicting city dwellers is not some minor inconvenience. And there's no app to fix that. Nor can hardware solve this problem. But smart hardware can at least help. For about a month I've been road-testing a wi-fi connected air purifier made by Swedish company, Blueair. It uses an Hepa filtration system combined with integrated air quality sensors to provide real-time in-app feedback which can be reassuring or alert you to unseen problems. If you're even vaguely environmentally aware it's fascinating and not a little horrifying to see how variable the air quality is inside your home. Everyday stuff like cooking, cleaning and changing the sheets can cause drastic swings in PM 2.5 and tVOC levels.