This is a very interesting concept of a game, and the missions are quite interesting, and there's a rather nice freeplay mode... the problem is, the controls are rather... awkward. Your emergency personnel have almost no independent initiative whatsoever - for instance, in order to recover a casualty, you need to order your ambulance to move to them, order your paramedics to get out of the vehicle, order them to pick up the casualty, order them to return to the ambulance, and then (if in freeplay) order them to return to base. Generally, unless given explicit orders, your units won't do anything on their own... and complicating things, the interface for selecting and controlling your units is awkward.
Civilians are even worse. Its not that they panic upon seeing danger or anything, they just don't notice. They'll happily walk into a fire or a poison cloud... or, popularly, an electrified wire. You're supposed to be able to order police to establish a cordon, but this requires so much handholding it's almost pointless.
That said, if the concept appeals to you, the game is quite fun. It just has quite a few rough edges.