The phrase "activity of concern" is correct and usable in written English.
It can be used in contexts where you want to refer to a specific action or behavior that raises issues or requires attention.
Example: "The recent increase in pollution levels is an activity of concern for environmentalists."
Alternatives: "issue of concern" or "matter of concern".
A former intelligence officer said, "We have to find some way of getting their attention," and referred specifically to a trip in May by Secretary of State Colin L. Powell and a subsequent visit by an assistant secretary of state in which President Bashar al-Assad promised to curb activities of concern to Washington, but then apparently did not do so.
Caregivers will be asked to identify three daily activities of concern where they or their child hope to improve after lower limb BoNT-A injections [ 17, 85].
As well as being involved in carcinogenesis, loss of the MMR activity is of concern with respect to the use of chemotherapeutic agents to treat established tumours.
Variability induced by placing weight on the specific activity is of concern when evaluating progression of condition and effectiveness of treatments or interventions over time.
Many small investors were burned by the scandalous activities of concerns like Union Pacific Railroad, which, like Global Crossing, stretched the boundaries of corporate behavior in its day.
Chua's focus is unrelentingly on solitary activities in the home, with no encouragement of group activities, or of concern for others, either in school or in the wider community.
For instance, a proposal by four researchers from the Center for International and Security Studies at Maryland would have classified Fouchier's work as an "activity of extreme concern" that would have required international pre-approval.
"Mildly monitoring" the online conversations of kids to detect activity of genuine concern seems like a no-brainer to me.
Exposure may take place via hand-to-mouth activity (of particular concern for children), although dermal absorption and inhalation of suspended particles may also be possible.
