atmosphere · noun /ˈæt.mə.sfɪər/Full view
atmosphere (FEELING)
B1 no plural the feeling which exists in a place or situation
Dictionary examples:

There's a very relaxed atmosphere in our office.

There has been an atmosphere of gloom in the factory since it was announced that it would be closing.

Learner example:

You'll also love the friendly atmosphere here. (Preliminary English Test; B1; Swiss German)

the atmosphere
B2 the mixture of gases around the Earth
Dictionary example:

These factories are releasing toxic gases into the atmosphere.

Learner example:

I'm against cars because their CO2 emissions destroy the atmosphere. (First Certificate in English; B2; Spanish)

atmosphere (AIR INSIDE)
B2 no plural the air inside a room or other place
Dictionary example:

The atmosphere in the room was so stuffy I could hardly breathe.

Learner example:

The atmosphere in the halls also became hot and humid, thus making the whole experience rather unpleasant. (First Certificate in English; B2; Chinese)

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