I found these links through Google, Genuine. Sounds like that place isn't well ventiliated enough. I'm not sure I'd stick around for further exposure, but I didn't find anything that said much about hazards from repeated exposure--just that it's a powerful pulmonary irritant.
The Facts About Chlorine
ATSDR - MMG: Chlorine

I know there are a good many studies that say chlorine-treated drinking water raises our chances of certain types of cancer, and if it's a potential carcinogen when ingested, it makes sense to me that it might be when inhaled, too--at least over the long-term.
What you dont know about chlorine could hurt you