(Eaton, OH)--Two people were hospitalized after being exposed to a chemical in the swimming pool area of the Preble County YMCA in Eaton on Thursday.  It happened late Thursday afternoon.  The two people were exposed to 12.5% chlorine vapor in the pool area.  The pool was evacuated.  They were the only two people in the pool area at the time.  Fire crews checked the air quality throughout the building.  Details on how the exposure occurred have not been released.  The pool had been closed recently for maintenance and repair.