Interesting article and definitely something to keep in mind with pools. But not so much related to a chlorine allergy which seems to be rare.

Swimming in indoor pools can cause people to develop asthma type symptoms. It's not the chlorine itself that is so dangerous but when it's combined with other organics it can make you sick.

Although this article doesn't talk much about chlorine allergy either, it is very educational about the affects of chlorine on asthma. It was very interesting that it mentioned that one quarter of the US swim team suffered some degree of asthma at the Olympics in Australia. And the comparison the article does between smokers and children exposed to chlorine is astounding.