Add different properties for separate tiles?

[Amanite]

Hello,
Let's say I'd like to make a campaign on Mars about terraforming.
How can I simulate lack of oxygen? I wish I could add a special tile property hasOxygen so I can create like a zone with pressured air and a zone without, where air tanks would be needed not to lose health.
Or maybe radioactive terrain.

[FreeER]

This would be a nice additon to modding capabilities