The phrase "although the concerns" is correct and usable in written English.
It can be used to introduce a contrast or exception regarding the concerns being discussed.
Example: "Although the concerns about the project's feasibility were valid, the team decided to move forward with the plan."
Alternatives: "even though the concerns" or "despite the concerns".
Although the concerns at this point are focused more on access to Mr. McCain than on major policy differences, there have been some substantive areas of dispute.
It points out that although the concerns of the critics of modern agriculture may be understandable, the reaction against intensive farming is a luxury of the rich.
Overall, markets continued to come under pressure again on fears of an imminent attack on Syria, although the concerns eased somewhat as the day progressed and discussions were set to begin at the United Nations.
Although the concerns about the long-term safety of bone drugs are not new, the F.D.A. performed its own systematic review of the effectiveness of bisphosphonates after years of use.
Although the concerns of the eugenics movement don't map neatly onto today's political divides, patterns of thought are repeated: fears of procreation and infiltration still have force, although they're directed not at "hopelessly vicious protoplasm" but at "anchor babies"; instead of the pure blood of the Nordic races, we hear invocations of that other superior species, the Winners.
In the case of Southern Europe, although the concerns were similar, a reform in transport policies had already been set in motion.
Although the concern for Nintendo's well-being is legitimate (they've been resting on their laurels for more than long enough), apparently they had enough juice for one last big holiday season.
Although the concern for a thiomersal-autism link was originally derived from indirect evidence based on the known potent neurotoxic effects of methylmercury, recent studies show these feared effects were likely overestimated.
Although not true, the concerns held by participants about the plastic bottles are not irrational and replicate concerns that other people seem to have.
Although I certainly understand the concerns driving these suggestions, it is essential that we resist the temptation to restrict our most fundamental freedoms in moment of panic.
Almost 90 people were thought to have been killed, although the trial concerns only 78 victims.
