This will depend on where you spawn your world:
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If you’re on a Level 1 world and spawn yourself a world, then you’ll get a Level 1 world connected to the world you’re on.
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If you’re on a harder Level 5 toxic world (say), then you’ll get a Level 5 toxic world connected to the world you’re on.
We have some ideas on the todo list about allowing Settlements to offer buffs to players. This would allow you to provide atmospheric protection to visitors automatically.