Are Indoor Pools Bad for Your Lungs?

My daughter likes to swim and she is actually a very good swimmer. Like to register for her to join a competive swim team. However, that requires three/four times training every week at a indoor pool. I have heard the indoor pools bad for the lungs. See this article http://well.blogs.nytimes.com/2009/07/22/are-indoor-pools-bad-for-your-lungs/?_php=true&_type=blogs&_r=0
So now I cannot make the final decision. Appreciate it very much for your input.