The phrase "professional air" is correct and usable in written English.
It can be used to describe an atmosphere or demeanor that conveys professionalism.
Example: "The conference had a professional air, with speakers dressed in business attire and a well-organized schedule."
Alternatives: "professional demeanor" or "businesslike atmosphere."
She studied me with a professional air.
I've got that professional air, God the Novelist told Himself.
Given such commotion, what's most surprising is the E.R.'s sense of order, its predominant and professional air of calm.
He said he hoped to win the world championships, whereupon he intended to call his boss, quit his job and become a professional air guitarist.
Dressed in a neat two-piece outfit, as if she were preparing for a job interview, she presented a certain professional air.
THE ROOM Decorated in an understated palette of beige and gray, with handsome mahogany furniture, my room had an expensive, professional air, complete with a wide, banker-style desk.
Professional air-show pilot Mike Murphy won the trophy three times, and he later led in international postwar aerobatic competitions as organized by the FAI (Fédération Aéronautique Internationale).
The guards at the walled compound here, in their blue berets and polished armored cars, are striking with their professional military air.
The new facility offered courses in social studies, drama, art, and journalism as well as vocational studies in clothing design, professional childcare, air conditioning repair, and metalworking.
As Peggy learned in "The Suitcase," there's really nothing like a good, old-fashioned tete-a-tete with your supervisor to help clarify your professional goals, air any grievances about your compensation or workload, and open up about that time you secretly gave birth to a baby and he came to see you in the hospital.
You can buy this product at an office or supply store, and although it is somewhat expensive ($7-$7-$10can) it goes a long way and is a lot less expensive than calling in a professional "compressed air" cleaning company.
