The phrase "a serious air" is correct and usable in written English.
It can be used to describe a demeanor or atmosphere that conveys seriousness or gravity.
Example: "Despite the festive decorations, there was a serious air in the room as the team discussed the challenges ahead."
Alternatives: "a solemn atmosphere" or "a grave demeanor".
"A serious air + pessimism, thus a formidable cocktail that some filmmakers (Michael Haneke, Béla Tarr, Christopher Nolan, Nuri Bilge Ceylan) overuse in order to show us what they think of the world.
Another sequence (Slide 2) shows five women following a similar set of expressions and poses that include a smile, a serious air and hands behind the head, revealing what a typical portrait session with Mr. Mangum might have entailed.
He was clearly the best-liked player on the course... Patton is a tall, broad-shouldered, bespectacled, thirty-one-year-old lumber executive, and he has a serious air that covers a considerable capacity for merriment.
After three months of this, for a reason I now forget, I ventured solo into Simpson's in the Strand, a clubby British beef parlor with paneled walls, waiters in tails and a serious air of condescension.
It warned the government that the project, in which Whitehall has a 49% stake, seven British airlines 46% and staff 5%, would not survive adverse economic circumstances or a serious air disaster.
According to Xinhua News Agency, nitrogen dioxide pollution remains a serious air quality concern in the area.
Our only real solution — a strategy to reignite consistent growth so we can narrow our income gaps and lift the middle class — never got a serious airing.
It's too early to talk of success, but I am thrilled the problem is getting a serious airing in Brussels.
So far, North Dakota health officials say that flaring has not produced any serious air pollution problems.
"I would have thought they have got away with it because I do not remember hearing of any serious air frost in the past 14 days".
The Miss America Pageant has hired a new television producer in an effort to give the pageant's annual broadcast a more serious air, the organization announced yesterday.
