This is the 7546th most frequent Japanese word.
冷気
Cold air; chill.
Here, '冷気' refers to the cold air or the chill from the morning atmosphere. It is used as a noun to describe the physical presence of cold air.
朝の冷気が部屋に入り込んできた。
The morning chill seeped into the room.
In this context, '冷気' refers to the cold air or a draft that one wants to prevent from entering the room. It symbolizes something undesirable in terms of comfort.
冷気を防ぐために窓を閉めました。
I closed the window to prevent the chill.
Here, '冷気' is interpreted as the ambient cold air felt during winter. It enhances the sensory experience of walking in such an environment.