Respiratory risks of indoor swimming pools
Respiratory risks of indoor swimming pools can include coughing, wheezing, aggravated asthma, and airway hyper-responsiveness (spasms of the bronchial tubes in the lungs causing coughing and chest tightness). The chemicals used for pool water disinfection can react with organic compounds in the water to create disinfection by-products or DBPs.
Source: Wikipedia — Respiratory risks of indoor swimming pools (CC BY-SA 4.0)