The phrase "a passing concern" is correct and usable in written English.
It can be used to describe something that is not a significant or long-lasting worry or issue.
Example: "While the budget cuts were a passing concern for the team, they quickly shifted their focus to more pressing matters."
Alternatives: "a fleeting worry" or "a temporary issue."
This market has negligible interest in hockey and only a passing concern for baseball.
Ministerial memos betrayed a passing concern – that Aamer too might launch litigation in the UK.
It is more than a passing concern for Ms. Gillibrand, who is still working to win over New York voters, especially downstate.
If Breaking Bad is going to move up to the big table, its women have to be more than a passing concern.
We can complain about it, but however big our meetings and rallies we can only reach the broad mass of a public, for whom formal politics is a passing concern, through the mainstream media.
But in an industry where earnings are viewed as the overwhelming marker of status, it's safe to assume that the figure is more than a passing concern for the contenders.
Groom's pet peeve is the way recent scholarly work has wrenched the figure of the vampire from its political and social origins and turned it into an ahistorical archetype on which to dump any passing concerns.
The ordinary struggles of survival — food, sleep, sanitation — are of only passing concern.
The Hebrew scriptures are pretty well convinced that the way God's people treat refugees and immigrants is of more than passing concern to the Almighty.
The issue will be of only passing concern to most of Orange County, since the 24-watt station's signal can be picked up only within a few miles of the Irvine campus.
She spent four years working on "Divers," a work so lyrical and precisely rendered that Hollywood obligations and a Disney-esque mansion seem like passing concerns.
