Basically, there's no noise isolation at all, even less than with standard earbuds. You push the volume up to compensate for noise and damage your ears. Take away: use them at home or in quiet places, don't use them in the street, subway, or other loud environments.
Reversing the smart city paradigm. Barcelona is moving from the surveillance capitalism model, where data is opaque and owned by subcontractors and third parties, to a model where citizens own their data.