Please just take the hint.
The morning winter air is cold.
The monkey in the pirate’s space ship will be reentering the atmosphere in 3 hours. He can’t wait to draw as much air into his lungs as possible.
The sky energy... once known of as a mystical thing that kept us from flying into space. Now we know this is the air. It can also mean atmosphere, though, because that's what a bunch of air between the earth and space is called. ここの空気はいいね！
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.