1. The mixture of gases which forms the earth's atmosphere and which we breathe. English = air.
2. Fresh air which has been allowed into a room or building, e.g., by open windows. English = ventilation.
3. The layer of air or other gases around a planet. English = atmosphere.
4. The general impression you get of a place, especially when it is good and interesting. English = atmosphere.
5. The feeling of a place and the feeling of the people in it. English = mood.