Your unique mobile device WiFi MAC addresses as well as your Bluetooth unique address can give away enough information to identify you and track your location in public spaces even if you don't establish a connection. There are various security concerns about this. For example in the article
there is a discussion about the Dublin airport using such information to track queues, which however could be misused by authorities to track individuals. The same applies to other public spaces like Shopping Malls etc.
Since this tracking would be mostly passive could there be a way to know that you are being tracked by signals your WiFi or Bluetooth are emitting?