Plague Inc. Wiki

Air 1 is a tier 1 transmission. It increases infectivity, with a bonus in arid environments. It also gives a bonus in plane transmission, making it more likely that a plague will successfully board a plane, thereby infecting countries by that way.

Government actions

If evolved while the disease is noticed, governments will start to give out face masks, decreasing infection rates by 3%.


  • Sometimes, the player will encounter an event where air filters are used on airplanes. This will stop airplanes from being infected until you evolve Air 1, or Air 2 if the event occurs after the evolution of Air 1. If the event happens before Air 2 is evolved, you will need Extreme Bioaerosol.