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.
Se observades o eixo Y do gráfico, veredes que, no aire ventilado mecánicamente, hay máis posibilidades de atopar patóxenos potenciais, ou xermes, que si estamos fóra.