The phrase "are getting increasingly concerned" is correct and usable in written English.
It can be used to describe a gradual increase in worry or unease about a particular issue or situation. Example: As the number of COVID-19 cases continues to rise, many people are getting increasingly concerned about the impact it will have on the economy.
Heads of companies, political leaders, scientists, educators, parents and the average citizen are getting increasingly concerned about the state of the world.
Design professionals, roof consultants, contractors, facility managers and building scientists are getting increasingly concerned with mandates that limit their ability to choose the most energy-efficient roofing materials.
"Europeans are getting increasingly concerned about energy," said Corin Taylor, an analyst at the Institute of Directors, a British business group.
By this time the Mexican government was getting increasingly concerned about a spike in atypical and fatal flu cases.
Over the weekend, it was clear that some Republicans on Capitol Hill were getting increasingly concerned about the Flynn/Russia stories and the larger questions they raised.
"I'm getting increasingly concerned that one of the reasons the speaker is deciding to, I think, string out these discussions is that he wants to wait until Jan . 3 when the election for speaker takes place," he said.
"Although the worst of the labor market downturn seems behind, many people remain worried about the possibility of losing their job," he said, adding, "consumers seem to be getting increasingly concerned about the income implications of future fiscal tightening".
Speaking on the BBC's Andrew Marr Show on Sunday, Ball said police were getting increasingly concerned about the growing trend of young women planning to make the treacherous journey from Britain – many of whom are disguised to avoid suspicion.
"Our client was getting increasingly concerned that this could end up with the club going into liquidation and then the club would have disappeared.
"I'm getting increasingly concerned that one of the reasons the speaker is trying to, I think, string out these discussions is that he wants to wait until January 3 when the elections for speaker take place," the House Democratic budget chief told reporters at a breakfast hosted by the Christian Science Monitor.
