The warmth of this room after the cold outer air, perhaps.

A fine mist was coming up as they emerged from the Hotel into the cool outer air.

The outer air swept in with greater authority, and the warm mass rose faster.

We will share your burdens," It was cold in the outer air.

All passage for the outer air would be closed.

Yet this passage to the outer air afforded no means of escape.

If so, was there any present gate of escape to the known parts or to the outer air?

An underground chamber which must open somewhere to the outer air.

One day I felt an urge to see the sunlight and smell the outer air.

The outer air was even colder than that in his room.