Indicator appears on the screen. If you went out into the street, and in the street of the Sun, your immune system will be enhanced, if raining, you'd better get in the car and wait, otherwise the immunity strongly reduced. If you njuhaete exhaust machines, the immunity will decrease as well. Passing next to people, immunity may also fall, and if we pass next to the homeless. If you nesjotes at breakneck speed on a motorbike, then goodbye with immunity. And a lot of different things, to the point that riding in the car with the doors open will reduce immunity!