I absolutely love this. On one hand you've got the peacefulness of mellow ambient music, and on the other, the potential death, doom and destruction from the police channels. It properly conveys the 'techno' feeling that something can go horribly wrong at any moment.
It's very much a techno thing, reminiscent of a track like Space Manoeuvres' "Stage One". I'm not sure if it's ethical to do it with live emergency communications, though.