The phrase "a long-standing concern" is correct and usable in written English.
It can be used to refer to an issue or problem that has persisted for a significant amount of time.
Example: "Climate change has been a long-standing concern for scientists and policymakers alike."
Alternatives: "an ongoing issue" or "a persistent worry".
A long-standing concern for the environment led me to earmark $600 for Greenpeace.
And among his Latin American group of bishops, America's embargo on Cuba was a long-standing concern.
He called the mix of education and enforcement "a simple but effective way to combat a long-standing concern".
This reflects a long-standing concern that Britain's investors are too impatient for the long bets that technology companies require.But entrepreneurs' biggest difficulty is finding staff.
He worked hard for environmental measures, a long-standing concern of his, even though he seldom came out in front on such issues.
Growing up in a Scots-Italian family in insalubrious Paisley, the singer at first seemed fated for the family fish-and-chip business, a long-standing concern first established when his paternal great-grandparents emigrated from Barga, Tuscany in the early 1900s.
A long standing concern with means-tested social welfare payments for low income families with school-age children is that they can reduce incentives to participate in the labour market, potentially leading to long episodes of welfare dependence, depreciation of human capital, and ultimately exacerbating rather than alleviating poverty.
There is a long standing concern that minorities, in particular African Americans and Hispanics, are less willing to participate in clinical research than non-minorities.
Whether vignette studies like ours may be representative of real life practice has been a long standing concern [ 17], although there are some studies in support of their validity [ 18– 218.
In an open letter to Turkish president Rece Tayyip Erdoğan, organised by press freedom organisation English PEN, the writers say they are seriously concerned about Rasool and say the country's "routine" use of counter-terrorism charges to suppress journalists is a cause of "long-standing concern".
Government ministers are busy making false promises instead of working to find a real solution to this long-standing concern".
