He mangled his sentence a little: pre-European invasion of the 'American' continents.

"Yes. And I am talking about my comfort. Every time the door opens the atmospheres of the connected worlds mingle and change. That gives me the equivalent of a mild ice-cream headache all over my body." He waves at the full body covering clothing, "My uniform helps protect me from some of the pain, and it's not as bad as when I wasn't real, but this still isn't my favourite place."