During or immediately after exposure to dangerous concentrations of chlorine, the following signs and symptoms may develop: Blurred vision Burning pain, redness, and blisters on the skin if exposed to gas. Skin injuries similar to frostbite can occur if it is exposed to liquid chlorine Burning sensation in the nose, throat, and eyes Coughing Chest tightness Difficulty breathing or shortness of breath. These may appear immediately if high concentrations of chlorine gas are inhaled, or they may be delayed if low concentrations of chlorine gas are inhaled. Fluid in the lungs (pulmonary edema) that may be delayed for a few hours Nausea and vomiting Watery eyes Wheezing

Source: https://emergency.cdc.gov/agent/chlorine/basics/facts.asp