Smoke poured into the sky from an iron chimney and Ca'daan could feel the heat of the place even in the mid-morning sun.
The air was cool and clear in the night sky that Jon was traversing. 
mnli hypothesis: The air was cool and clear in the night sky that Jon was traversing.  premise: Smoke poured into the sky from an iron chimney and Ca'daan could feel the heat of the place even in the mid-morning sun.