If you look at the y-axis of this graph, you'll see that, in the mechanically ventilated air, you have a higher probability of encountering a potential pathogen, or germ, than if you're outdoors.
Ukoliko pogledate y-os ovog grafa, vidjeti ćete da, u mehanički ventiliranom zraku, imate veće šanse susretanja potencijalnog patogena, ili klice, nego kada ste vani.