bad for asthma sufferers Chlorine in Pools May Cause Breathing Trouble حساسية الجهاز التنفسي A 2004 study revealed Chlorine in Pools May Cause Breathing Trouble induce asthma-like symptoms Chlorine in Pools May Cause Breathing Trouble Chlorine in Pools May Cause Breathing Problems Chlorine in Pools May Cause Breathing Problems Chlorine in Pools May Cause Breathing Problems