manner or appearance:
Examples: >
• She has an air of confidence about her.
• He had a slight air of menace which I found unsettling.
• I just assumed he owned the place – he had a proprietary air about him.
• The company operates out of modern offices and expensive hotel suites to create an air of respectability.

An impression of a quality or manner given by someone or something. >
• ‘she answered with a faint air of boredom’
• ‘he leaned over with a confidential air’

• a feeling or attitude that someone has
  She spoke with her usual air of authority.
• the feeling that a place or situation gives you
  The overgrown lawn gave the house a neglected air.
  There was an air of gloom about the whole trial.

Here’s an example of usage “in the wild” that seems to match your example:

There is an air of happiness and contentment at Tuningi which soon makes one forget the stresses of life.  …
— Review of Tuningi Safari Lodge – TripAdvisor

The verb project goes well with the phrase an air of:

Dresow knew he couldn’t look unsure of himself as he walked in.  You need to “just walk in like you know what you’re doing even if you don’t,” he says.  Most importantly, he needed to project an air of authority, conviction, and certainty.  …
— How To Enter A Room Like A Boss, Business Insider

More examples from recent headlines:

Paris climate change talks yield first draft amid air of optimism
— The Guardian

<%%>

There’s an air of menace about this campaign
— The Washington Post

(I bolded words in the above examples for emphasis.)

Related: Meaning of “a certain air of”.

manner or appearance:
Examples: >
• She has an air of confidence about her.
• He had a slight air of menace which I found unsettling.
• I just assumed he owned the place – he had a proprietary air about him.
• The company operates out of modern offices and expensive hotel suites to create an air of respectability.

An impression of a quality or manner given by someone or something. >
• ‘she answered with a faint air of boredom’
• ‘he leaned over with a confidential air’

• a feeling or attitude that someone has
  She spoke with her usual air of authority.
• the feeling that a place or situation gives you
  The overgrown lawn gave the house a neglected air.
  There was an air of gloom about the whole trial.

Here’s an example of usage “in the wild” that seems to match your example:

There is an air of happiness and contentment at Tuningi which soon makes one forget the stresses of life.  …
— Review of Tuningi Safari Lodge – TripAdvisor

The verb project goes well with the phrase an air of:

Dresow knew he couldn’t look unsure of himself as he walked in.  You need to “just walk in like you know what you’re doing even if you don’t,” he says.  Most importantly, he needed to project an air of authority, conviction, and certainty.  …
— How To Enter A Room Like A Boss, Business Insider

More examples from recent headlines:

Paris climate change talks yield first draft amid air of optimism
— The Guardian

<%%>

There’s an air of menace about this campaign
— The Washington Post

(I bolded words in the above examples for emphasis.)

Related: Meaning of “a certain air of”.

manner or appearance:
Examples: >
• She has an air of confidence about her.
• He had a slight air of menace which I found unsettling.
• I just assumed he owned the place – he had a proprietary air about him.
• The company operates out of modern offices and expensive hotel suites to create an air of respectability.

An impression of a quality or manner given by someone or something. >
• ‘she answered with a faint air of boredom’
• ‘he leaned over with a confidential air’

• a feeling or attitude that someone has
  She spoke with her usual air of authority.
• the feeling that a place or situation gives you
  The overgrown lawn gave the house a neglected air.
  There was an air of gloom about the whole trial.

Here’s an example of usage “in the wild” that seems to match your example:

There is an air of happiness and contentment at Tuningi which soon makes one forget the stresses of life.  …
— Review of Tuningi Safari Lodge – TripAdvisor

The verb project goes well with the phrase an air of:

Dresow knew he couldn’t look unsure of himself as he walked in.  You need to “just walk in like you know what you’re doing even if you don’t,” he says.  Most importantly, he needed to project an air of authority, conviction, and certainty.  …
— How To Enter A Room Like A Boss, Business Insider

More examples from recent headlines:

Paris climate change talks yield first draft amid air of optimism
— The Guardian

<%%>

There’s an air of menace about this campaign
— The Washington Post

(I bolded words in the above examples for emphasis.)

Related: Meaning of “a certain air of”.